#include <wchar.h>
#include <stdint.h>
#include <sys/types.h>
#include <errno.h>
#include <math.h>
#include <limits.h>
#include <locale.h>
#include <signal.h>
#include <sys/select.h>

#include <time.h>
#include <unistd.h>
#include <stddef.h>
#include <libgen.h>
#include <ctype.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <termios.h>
#include <wchar.h>

#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/cursorfont.h>
#include <X11/keysym.h>
#include <X11/Xft/Xft.h>
#include <X11/XKBlib.h>

#if defined(__linux)
#include <pty.h>
#elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
#include <util.h>
#elif defined(__FreeBSD__) || defined(__DragonFly__)
#include <libutil.h>
#endif

typedef unsigned int uint;

char *argv0;
#define ARGBEGIN                                     \
    for (argv0 = *argv, argv++, argc--;              \
         argv[0] && argv[0][0] == '-' && argv[0][1]; \
         argc--, argv++)                             \
    {                                                \
        char argc_;                                  \
        char **argv_;                                \
        int brk_;                                    \
        if (argv[0][1] == '-' && argv[0][2] == '\0') \
        {                                            \
            argv++;                                  \
            argc--;                                  \
            break;                                   \
        }                                            \
        int i_;                                      \
        for (i_ = 1, brk_ = 0, argv_ = argv;         \
             argv[0][i_] && !brk_;                   \
             i_++)                                   \
        {                                            \
            if (argv_ != argv)                       \
                break;                               \
            argc_ = argv[0][i_];                     \
            switch (argc_)
#define ARGEND \
    }          \
    }
#define ARGC() argc_
#define EARGF(x) ((argv[0][i_ + 1] == '\0' && argv[1] == NULL) ? ((x), abort(), (char *)0) : (brk_ = 1, (argv[0][i_ + 1] != '\0') ? (&argv[0][i_ + 1]) : (argc--, argv++, argv[0])))
#define ARGF() ((argv[0][i_ + 1] == '\0' && argv[1] == NULL) ? (char *)0 : (brk_ = 1, (argv[0][i_ + 1] != '\0') ? (&argv[0][i_ + 1]) : (argc--, argv++, argv[0])))

#define XK_NO_MOD 0

#define XK_ANY_MOD UINT_MAX

#define XK_SWITCH_MOD (1 << 13 | 1 << 14)
typedef union
{
    int i;
    uint ui;
    float f;
    const void *v;
    const char *s;
} Arg;

typedef struct
{
    uint mod;
    KeySym keysym;
    void (*func)(const Arg *);
    const Arg arg;
} Shortcut;
typedef struct
{
    uint mod;
    uint button;
    void (*func)(const Arg *);
    const Arg arg;
    uint release;
} MouseShortcut;
typedef struct
{
    KeySym k;
    uint mask;
    char *s;
    signed char appkey;
    signed char appcursor;
} Key;
#define MODKEY Mod1Mask
#define TERMMOD (ControlMask | ShiftMask)

void sendbreak(const Arg *);
void printscreen(const Arg *);
void printsel(const Arg *);
void toggleprinter(const Arg *);
enum selection_type
{
    SEL_REGULAR = 1,
    SEL_RECTANGULAR = 2
};
#if 1
static char *font = "Liberation Mono:pixelsize=40:antialias=true:autohint=true";
static int borderpx = 2;
static char *shell = "/bin/sh";
char *utmp = NULL;
char *scroll = NULL;
char *stty_args = "stty raw pass8 nl -echo -iexten -cstopb 38400";
char *vtiden = "\033[?6c";
static float cwscale = 1.0;
static float chscale = 1.0;
wchar_t *worddelimiters = L" ";
static unsigned int doubleclicktimeout = 300;
static unsigned int tripleclicktimeout = 600;
int allowaltscreen = 1;
int allowwindowops = 0;
static double minlatency = 2;
static double maxlatency = 33;
static unsigned int blinktimeout = 800;
static unsigned int cursorthickness = 2;
static int bellvolume = 0;
char *termname = "st-256color";
unsigned int tabspaces = 8;
#if 0

static const char *colorname[] = {
    "black",
    "red3",
    "green3",
    "yellow3",
    "blue2",
    "magenta3",
    "cyan3",
    "gray90",
    "gray50",
    "red",
    "green",
    "yellow",
    "#5c5cff",
    "magenta",
    "cyan",
    "white",
    [255] = 0,
    "#cccccc",
    "#555555",
    "gray90",
    "black",
};
#else
static const char *colorname[] = {
    /* 8 normal colors - soft, modern palette */
    "#1e1e2e", /* 0: black (dark background) */
    "#f38ba8", /* 1: red (soft pink-red) */
    "#a6e3a1", /* 2: green (soft mint) */
    "#f9e2af", /* 3: yellow (soft amber) */
    "#89b4fa", /* 4: blue (soft sky blue) */
    "#cba6f7", /* 5: magenta (soft lavender) */
    "#94e2d5", /* 6: cyan (soft teal) */
    "#6c7086", /* 7: gray90 (medium gray) */

    /* 8 bright colors - slightly lighter versions */
    "#585b70", /* 8: gray50 (darker gray) */
    "#fab387", /* 9: red (brighter peach) */
    "#a6e3a1", /* 10: green (same as normal, brighter) */
    "#f9e2af", /* 11: yellow (same as normal, brighter) */
    "#89b4fa", /* 12: blue (same as normal, brighter) */
    "#cba6f7", /* 13: magenta (same as normal, brighter) */
    "#94e2d5", /* 14: cyan (same as normal, brighter) */
    "#cdd6f4", /* 15: white (light gray for foreground) */

    [255] = 0, /* marker for end of default colors */

    /* Additional colors for defaults */
    "#cdd6f4", /* 256: cursor color (light gray) */
    "#585b70", /* 257: reverse cursor background */
    "#cdd6f4", /* 258: default foreground (light gray) */
    "#1e1e2e", /* 259: default background (dark purple-gray) */
};

#endif
unsigned int defaultfg = 258;
unsigned int defaultbg = 259;
unsigned int defaultcs = 256;
static unsigned int defaultrcs = 257;
static unsigned int cursorshape = 2;
static unsigned int cols = 80;
static unsigned int rows = 24;
static unsigned int mouseshape = XC_xterm;
static unsigned int mousefg = 7;
static unsigned int mousebg = 0;
static unsigned int defaultattr = 11;
static uint forcemousemod = ShiftMask;
static void clipcopy(const Arg *);
static void clippaste(const Arg *);
static void numlock(const Arg *);
static void selpaste(const Arg *);
static void zoom(const Arg *);
static void zoomabs(const Arg *);
static void zoomreset(const Arg *);
static void ttysend(const Arg *);
static MouseShortcut mshortcuts[] = {
    {
        .mod = XK_ANY_MOD,
        .button = Button2,
        .func = selpaste,
        .arg = {.i = 0},
        .release = 1,
    },
    {
        .mod = ShiftMask,
        .button = Button4,
        .func = ttysend,
        .arg = {.s = "\033[5;2~"},
        .release = 0,
    },
    {
        .mod = XK_ANY_MOD,
        .button = Button4,
        .func = ttysend,
        .arg = {.s = "\031"},
        .release = 0,
    },
    {
        .mod = ShiftMask,
        .button = Button5,
        .func = ttysend,
        .arg = {.s = "\033[6;2~"},
        .release = 0,
    },
    {
        .mod = XK_ANY_MOD,
        .button = Button5,
        .func = ttysend,
        .arg = {.s = "\005"},
        .release = 0,
    },
};
static Shortcut shortcuts[] = {
    {XK_ANY_MOD, XK_Break, sendbreak, {.i = 0}},
    {ControlMask, XK_Print, toggleprinter, {.i = 0}},
    {ShiftMask, XK_Print, printscreen, {.i = 0}},
    {XK_ANY_MOD, XK_Print, printsel, {.i = 0}},
    {TERMMOD, XK_Prior, zoom, {.f = +1}},
    {TERMMOD, XK_Next, zoom, {.f = -1}},
    {TERMMOD, XK_Home, zoomreset, {.f = 0}},
    {TERMMOD, XK_C, clipcopy, {.i = 0}},
    {TERMMOD, XK_V, clippaste, {.i = 0}},
    {TERMMOD, XK_Y, selpaste, {.i = 0}},
    {ShiftMask, XK_Insert, selpaste, {.i = 0}},
    {TERMMOD, XK_Num_Lock, numlock, {.i = 0}},
};
static KeySym mappedkeys[] = {-1};
static uint ignoremod = Mod2Mask | XK_SWITCH_MOD;
static Key key[] = {
    {XK_KP_Home, ShiftMask, "\033[2J", 0, -1},
    {XK_KP_Home, ShiftMask, "\033[1;2H", 0, +1},
    {XK_KP_Home, XK_ANY_MOD, "\033[H", 0, -1},
    {XK_KP_Home, XK_ANY_MOD, "\033[1~", 0, +1},
    {XK_KP_Up, XK_ANY_MOD, "\033Ox", +1, 0},
    {XK_KP_Up, XK_ANY_MOD, "\033[A", 0, -1},
    {XK_KP_Up, XK_ANY_MOD, "\033OA", 0, +1},
    {XK_KP_Down, XK_ANY_MOD, "\033Or", +1, 0},
    {XK_KP_Down, XK_ANY_MOD, "\033[B", 0, -1},
    {XK_KP_Down, XK_ANY_MOD, "\033OB", 0, +1},
    {XK_KP_Left, XK_ANY_MOD, "\033Ot", +1, 0},
    {XK_KP_Left, XK_ANY_MOD, "\033[D", 0, -1},
    {XK_KP_Left, XK_ANY_MOD, "\033OD", 0, +1},
    {XK_KP_Right, XK_ANY_MOD, "\033Ov", +1, 0},
    {XK_KP_Right, XK_ANY_MOD, "\033[C", 0, -1},
    {XK_KP_Right, XK_ANY_MOD, "\033OC", 0, +1},
    {XK_KP_Prior, ShiftMask, "\033[5;2~", 0, 0},
    {XK_KP_Prior, XK_ANY_MOD, "\033[5~", 0, 0},
    {XK_KP_Begin, XK_ANY_MOD, "\033[E", 0, 0},
    {XK_KP_End, ControlMask, "\033[J", -1, 0},
    {XK_KP_End, ControlMask, "\033[1;5F", +1, 0},
    {XK_KP_End, ShiftMask, "\033[K", -1, 0},
    {XK_KP_End, ShiftMask, "\033[1;2F", +1, 0},
    {XK_KP_End, XK_ANY_MOD, "\033[4~", 0, 0},
    {XK_KP_Next, ShiftMask, "\033[6;2~", 0, 0},
    {XK_KP_Next, XK_ANY_MOD, "\033[6~", 0, 0},
    {XK_KP_Insert, ShiftMask, "\033[2;2~", +1, 0},
    {XK_KP_Insert, ShiftMask, "\033[4l", -1, 0},
    {XK_KP_Insert, ControlMask, "\033[L", -1, 0},
    {XK_KP_Insert, ControlMask, "\033[2;5~", +1, 0},
    {XK_KP_Insert, XK_ANY_MOD, "\033[4h", -1, 0},
    {XK_KP_Insert, XK_ANY_MOD, "\033[2~", +1, 0},
    {XK_KP_Delete, ControlMask, "\033[M", -1, 0},
    {XK_KP_Delete, ControlMask, "\033[3;5~", +1, 0},
    {XK_KP_Delete, ShiftMask, "\033[2K", -1, 0},
    {XK_KP_Delete, ShiftMask, "\033[3;2~", +1, 0},
    {XK_KP_Delete, XK_ANY_MOD, "\033[P", -1, 0},
    {XK_KP_Delete, XK_ANY_MOD, "\033[3~", +1, 0},
    {XK_KP_Multiply, XK_ANY_MOD, "\033Oj", +2, 0},
    {XK_KP_Add, XK_ANY_MOD, "\033Ok", +2, 0},
    {XK_KP_Enter, XK_ANY_MOD, "\033OM", +2, 0},
    {XK_KP_Enter, XK_ANY_MOD, "\r", -1, 0},
    {XK_KP_Subtract, XK_ANY_MOD, "\033Om", +2, 0},
    {XK_KP_Decimal, XK_ANY_MOD, "\033On", +2, 0},
    {XK_KP_Divide, XK_ANY_MOD, "\033Oo", +2, 0},
    {XK_KP_0, XK_ANY_MOD, "\033Op", +2, 0},
    {XK_KP_1, XK_ANY_MOD, "\033Oq", +2, 0},
    {XK_KP_2, XK_ANY_MOD, "\033Or", +2, 0},
    {XK_KP_3, XK_ANY_MOD, "\033Os", +2, 0},
    {XK_KP_4, XK_ANY_MOD, "\033Ot", +2, 0},
    {XK_KP_5, XK_ANY_MOD, "\033Ou", +2, 0},
    {XK_KP_6, XK_ANY_MOD, "\033Ov", +2, 0},
    {XK_KP_7, XK_ANY_MOD, "\033Ow", +2, 0},
    {XK_KP_8, XK_ANY_MOD, "\033Ox", +2, 0},
    {XK_KP_9, XK_ANY_MOD, "\033Oy", +2, 0},
    {XK_Up, ShiftMask, "\033[1;2A", 0, 0},
    {XK_Up, Mod1Mask, "\033[1;3A", 0, 0},
    {XK_Up, ShiftMask | Mod1Mask, "\033[1;4A", 0, 0},
    {XK_Up, ControlMask, "\033[1;5A", 0, 0},
    {XK_Up, ShiftMask | ControlMask, "\033[1;6A", 0, 0},
    {XK_Up, ControlMask | Mod1Mask, "\033[1;7A", 0, 0},
    {XK_Up, ShiftMask | ControlMask | Mod1Mask, "\033[1;8A", 0, 0},
    {XK_Up, XK_ANY_MOD, "\033[A", 0, -1},
    {XK_Up, XK_ANY_MOD, "\033OA", 0, +1},
    {XK_Down, ShiftMask, "\033[1;2B", 0, 0},
    {XK_Down, Mod1Mask, "\033[1;3B", 0, 0},
    {XK_Down, ShiftMask | Mod1Mask, "\033[1;4B", 0, 0},
    {XK_Down, ControlMask, "\033[1;5B", 0, 0},
    {XK_Down, ShiftMask | ControlMask, "\033[1;6B", 0, 0},
    {XK_Down, ControlMask | Mod1Mask, "\033[1;7B", 0, 0},
    {XK_Down, ShiftMask | ControlMask | Mod1Mask, "\033[1;8B", 0, 0},
    {XK_Down, XK_ANY_MOD, "\033[B", 0, -1},
    {XK_Down, XK_ANY_MOD, "\033OB", 0, +1},
    {XK_Left, ShiftMask, "\033[1;2D", 0, 0},
    {XK_Left, Mod1Mask, "\033[1;3D", 0, 0},
    {XK_Left, ShiftMask | Mod1Mask, "\033[1;4D", 0, 0},
    {XK_Left, ControlMask, "\033[1;5D", 0, 0},
    {XK_Left, ShiftMask | ControlMask, "\033[1;6D", 0, 0},
    {XK_Left, ControlMask | Mod1Mask, "\033[1;7D", 0, 0},
    {XK_Left, ShiftMask | ControlMask | Mod1Mask, "\033[1;8D", 0, 0},
    {XK_Left, XK_ANY_MOD, "\033[D", 0, -1},
    {XK_Left, XK_ANY_MOD, "\033OD", 0, +1},
    {XK_Right, ShiftMask, "\033[1;2C", 0, 0},
    {XK_Right, Mod1Mask, "\033[1;3C", 0, 0},
    {XK_Right, ShiftMask | Mod1Mask, "\033[1;4C", 0, 0},
    {XK_Right, ControlMask, "\033[1;5C", 0, 0},
    {XK_Right, ShiftMask | ControlMask, "\033[1;6C", 0, 0},
    {XK_Right, ControlMask | Mod1Mask, "\033[1;7C", 0, 0},
    {XK_Right, ShiftMask | ControlMask | Mod1Mask, "\033[1;8C", 0, 0},
    {XK_Right, XK_ANY_MOD, "\033[C", 0, -1},
    {XK_Right, XK_ANY_MOD, "\033OC", 0, +1},
    {XK_ISO_Left_Tab, ShiftMask, "\033[Z", 0, 0},
    {XK_Return, Mod1Mask, "\033\r", 0, 0},
    {XK_Return, XK_ANY_MOD, "\r", 0, 0},
    {XK_Insert, ShiftMask, "\033[4l", -1, 0},
    {XK_Insert, ShiftMask, "\033[2;2~", +1, 0},
    {XK_Insert, ControlMask, "\033[L", -1, 0},
    {XK_Insert, ControlMask, "\033[2;5~", +1, 0},
    {XK_Insert, XK_ANY_MOD, "\033[4h", -1, 0},
    {XK_Insert, XK_ANY_MOD, "\033[2~", +1, 0},
    {XK_Delete, ControlMask, "\033[M", -1, 0},
    {XK_Delete, ControlMask, "\033[3;5~", +1, 0},
    {XK_Delete, ShiftMask, "\033[2K", -1, 0},
    {XK_Delete, ShiftMask, "\033[3;2~", +1, 0},
    {XK_Delete, XK_ANY_MOD, "\033[P", -1, 0},
    {XK_Delete, XK_ANY_MOD, "\033[3~", +1, 0},
    {XK_BackSpace, XK_NO_MOD, "\177", 0, 0},
    {XK_BackSpace, Mod1Mask, "\033\177", 0, 0},
    {XK_Home, ShiftMask, "\033[2J", 0, -1},
    {XK_Home, ShiftMask, "\033[1;2H", 0, +1},
    {XK_Home, XK_ANY_MOD, "\033[H", 0, -1},
    {XK_Home, XK_ANY_MOD, "\033[1~", 0, +1},
    {XK_End, ControlMask, "\033[J", -1, 0},
    {XK_End, ControlMask, "\033[1;5F", +1, 0},
    {XK_End, ShiftMask, "\033[K", -1, 0},
    {XK_End, ShiftMask, "\033[1;2F", +1, 0},
    {XK_End, XK_ANY_MOD, "\033[4~", 0, 0},
    {XK_Prior, ControlMask, "\033[5;5~", 0, 0},
    {XK_Prior, ShiftMask, "\033[5;2~", 0, 0},
    {XK_Prior, XK_ANY_MOD, "\033[5~", 0, 0},
    {XK_Next, ControlMask, "\033[6;5~", 0, 0},
    {XK_Next, ShiftMask, "\033[6;2~", 0, 0},
    {XK_Next, XK_ANY_MOD, "\033[6~", 0, 0},
    {XK_F1, XK_NO_MOD, "\033OP", 0, 0},
    {XK_F1, ShiftMask, "\033[1;2P", 0, 0},
    {XK_F1, ControlMask, "\033[1;5P", 0, 0},
    {XK_F1, Mod4Mask, "\033[1;6P", 0, 0},
    {XK_F1, Mod1Mask, "\033[1;3P", 0, 0},
    {XK_F1, Mod3Mask, "\033[1;4P", 0, 0},
    {XK_F2, XK_NO_MOD, "\033OQ", 0, 0},
    {XK_F2, ShiftMask, "\033[1;2Q", 0, 0},
    {XK_F2, ControlMask, "\033[1;5Q", 0, 0},
    {XK_F2, Mod4Mask, "\033[1;6Q", 0, 0},
    {XK_F2, Mod1Mask, "\033[1;3Q", 0, 0},
    {XK_F2, Mod3Mask, "\033[1;4Q", 0, 0},
    {XK_F3, XK_NO_MOD, "\033OR", 0, 0},
    {XK_F3, ShiftMask, "\033[1;2R", 0, 0},
    {XK_F3, ControlMask, "\033[1;5R", 0, 0},
    {XK_F3, Mod4Mask, "\033[1;6R", 0, 0},
    {XK_F3, Mod1Mask, "\033[1;3R", 0, 0},
    {XK_F3, Mod3Mask, "\033[1;4R", 0, 0},
    {XK_F4, XK_NO_MOD, "\033OS", 0, 0},
    {XK_F4, ShiftMask, "\033[1;2S", 0, 0},
    {XK_F4, ControlMask, "\033[1;5S", 0, 0},
    {XK_F4, Mod4Mask, "\033[1;6S", 0, 0},
    {XK_F4, Mod1Mask, "\033[1;3S", 0, 0},
    {XK_F5, XK_NO_MOD, "\033[15~", 0, 0},
    {XK_F5, ShiftMask, "\033[15;2~", 0, 0},
    {XK_F5, ControlMask, "\033[15;5~", 0, 0},
    {XK_F5, Mod4Mask, "\033[15;6~", 0, 0},
    {XK_F5, Mod1Mask, "\033[15;3~", 0, 0},
    {XK_F6, XK_NO_MOD, "\033[17~", 0, 0},
    {XK_F6, ShiftMask, "\033[17;2~", 0, 0},
    {XK_F6, ControlMask, "\033[17;5~", 0, 0},
    {XK_F6, Mod4Mask, "\033[17;6~", 0, 0},
    {XK_F6, Mod1Mask, "\033[17;3~", 0, 0},
    {XK_F7, XK_NO_MOD, "\033[18~", 0, 0},
    {XK_F7, ShiftMask, "\033[18;2~", 0, 0},
    {XK_F7, ControlMask, "\033[18;5~", 0, 0},
    {XK_F7, Mod4Mask, "\033[18;6~", 0, 0},
    {XK_F7, Mod1Mask, "\033[18;3~", 0, 0},
    {XK_F8, XK_NO_MOD, "\033[19~", 0, 0},
    {XK_F8, ShiftMask, "\033[19;2~", 0, 0},
    {XK_F8, ControlMask, "\033[19;5~", 0, 0},
    {XK_F8, Mod4Mask, "\033[19;6~", 0, 0},
    {XK_F8, Mod1Mask, "\033[19;3~", 0, 0},
    {XK_F9, XK_NO_MOD, "\033[20~", 0, 0},
    {XK_F9, ShiftMask, "\033[20;2~", 0, 0},
    {XK_F9, ControlMask, "\033[20;5~", 0, 0},
    {XK_F9, Mod4Mask, "\033[20;6~", 0, 0},
    {XK_F9, Mod1Mask, "\033[20;3~", 0, 0},
    {XK_F10, XK_NO_MOD, "\033[21~", 0, 0},
    {XK_F10, ShiftMask, "\033[21;2~", 0, 0},
    {XK_F10, ControlMask, "\033[21;5~", 0, 0},
    {XK_F10, Mod4Mask, "\033[21;6~", 0, 0},
    {XK_F10, Mod1Mask, "\033[21;3~", 0, 0},
    {XK_F11, XK_NO_MOD, "\033[23~", 0, 0},
    {XK_F11, ShiftMask, "\033[23;2~", 0, 0},
    {XK_F11, ControlMask, "\033[23;5~", 0, 0},
    {XK_F11, Mod4Mask, "\033[23;6~", 0, 0},
    {XK_F11, Mod1Mask, "\033[23;3~", 0, 0},
    {XK_F12, XK_NO_MOD, "\033[24~", 0, 0},
    {XK_F12, ShiftMask, "\033[24;2~", 0, 0},
    {XK_F12, ControlMask, "\033[24;5~", 0, 0},
    {XK_F12, Mod4Mask, "\033[24;6~", 0, 0},
    {XK_F12, Mod1Mask, "\033[24;3~", 0, 0},
    {XK_F13, XK_NO_MOD, "\033[1;2P", 0, 0},
    {XK_F14, XK_NO_MOD, "\033[1;2Q", 0, 0},
    {XK_F15, XK_NO_MOD, "\033[1;2R", 0, 0},
    {XK_F16, XK_NO_MOD, "\033[1;2S", 0, 0},
    {XK_F17, XK_NO_MOD, "\033[15;2~", 0, 0},
    {XK_F18, XK_NO_MOD, "\033[17;2~", 0, 0},
    {XK_F19, XK_NO_MOD, "\033[18;2~", 0, 0},
    {XK_F20, XK_NO_MOD, "\033[19;2~", 0, 0},
    {XK_F21, XK_NO_MOD, "\033[20;2~", 0, 0},
    {XK_F22, XK_NO_MOD, "\033[21;2~", 0, 0},
    {XK_F23, XK_NO_MOD, "\033[23;2~", 0, 0},
    {XK_F24, XK_NO_MOD, "\033[24;2~", 0, 0},
    {XK_F25, XK_NO_MOD, "\033[1;5P", 0, 0},
    {XK_F26, XK_NO_MOD, "\033[1;5Q", 0, 0},
    {XK_F27, XK_NO_MOD, "\033[1;5R", 0, 0},
    {XK_F28, XK_NO_MOD, "\033[1;5S", 0, 0},
    {XK_F29, XK_NO_MOD, "\033[15;5~", 0, 0},
    {XK_F30, XK_NO_MOD, "\033[17;5~", 0, 0},
    {XK_F31, XK_NO_MOD, "\033[18;5~", 0, 0},
    {XK_F32, XK_NO_MOD, "\033[19;5~", 0, 0},
    {XK_F33, XK_NO_MOD, "\033[20;5~", 0, 0},
    {XK_F34, XK_NO_MOD, "\033[21;5~", 0, 0},
    {XK_F35, XK_NO_MOD, "\033[23;5~", 0, 0},
};

static uint selmasks[] = {
    [SEL_RECTANGULAR] = Mod1Mask,
};
static char ascii_printable[] =
    " !\"#$%&'()*+,-./0123456789:;<=>?"
    "@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_"
    "`abcdefghijklmnopqrstuvwxyz{|}~";

#endif

enum win_mode
{
    MODE_VISIBLE = 1 << 0,
    MODE_FOCUSED = 1 << 1,
    MODE_APPKEYPAD = 1 << 2,
    MODE_MOUSEBTN = 1 << 3,
    MODE_MOUSEMOTION = 1 << 4,
    MODE_REVERSE = 1 << 5,
    MODE_KBDLOCK = 1 << 6,
    MODE_HIDE = 1 << 7,
    MODE_APPCURSOR = 1 << 8,
    MODE_MOUSESGR = 1 << 9,
    MODE_8BIT = 1 << 10,
    MODE_BLINK = 1 << 11,
    MODE_FBLINK = 1 << 12,
    MODE_FOCUS = 1 << 13,
    MODE_MOUSEX10 = 1 << 14,
    MODE_MOUSEMANY = 1 << 15,
    MODE_BRCKTPASTE = 1 << 16,
    MODE_NUMLOCK = 1 << 17,
    MODE_MOUSE = MODE_MOUSEBTN | MODE_MOUSEMOTION | MODE_MOUSEX10 | MODE_MOUSEMANY,
};
void xbell(void);
void xclipcopy(void);
void xfinishdraw(void);
void xloadcols(void);
int xsetcolorname(int, const char *);
int xgetcolor(int, unsigned char *, unsigned char *, unsigned char *);
void xseticontitle(char *);
void xsettitle(char *);
int xsetcursor(int);
void xsetmode(int, unsigned int);
void xsetpointermotion(int);
void xsetsel(char *);
int xstartdraw(void);
void xximspot(int, int);

#define MIN(a, b) ((a) < (b) ? (a) : (b))
#define MAX(a, b) ((a) < (b) ? (b) : (a))
#define LEN(a) (sizeof(a) / sizeof(a)[0])
#define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
#define DIVCEIL(n, d) (((n) + ((d) - 1)) / (d))
#define DEFAULT(a, b) (a) = (a) ? (a) : (b)
#define LIMIT(x, a, b) (x) = (x)<(a) ? (a) : (x)>(b) ? (b) : (x)
#define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || \
                       (a).bg != (b).bg)
#define TIMEDIFF(t1, t2) ((t1.tv_sec - t2.tv_sec) * 1000 + \
                          (t1.tv_nsec - t2.tv_nsec) / 1E6)
#define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
#define TRUECOLOR(r, g, b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
#define IS_TRUECOL(x) (1 << 24 & (x))
enum glyph_attribute
{
    ATTR_NULL = 0,
    ATTR_BOLD = 1 << 0,
    ATTR_FAINT = 1 << 1,
    ATTR_ITALIC = 1 << 2,
    ATTR_UNDERLINE = 1 << 3,
    ATTR_BLINK = 1 << 4,
    ATTR_REVERSE = 1 << 5,
    ATTR_INVISIBLE = 1 << 6,
    ATTR_STRUCK = 1 << 7,
    ATTR_WRAP = 1 << 8,
    ATTR_WIDE = 1 << 9,
    ATTR_WDUMMY = 1 << 10,
    ATTR_BOLD_FAINT = ATTR_BOLD | ATTR_FAINT,
};
enum selection_mode
{
    SEL_IDLE = 0,
    SEL_EMPTY = 1,
    SEL_READY = 2
};

enum selection_snap
{
    SNAP_WORD = 1,
    SNAP_LINE = 2
};
typedef unsigned char uchar;
typedef unsigned int uint;
typedef unsigned long ulong;
typedef unsigned short ushort;
typedef uint_least32_t Rune;
#define Glyph Glyph_
typedef struct
{
    Rune u;
    ushort mode;
    uint32_t fg;
    uint32_t bg;
} Glyph;
typedef Glyph *Line;

void die(const char *, ...);
void redraw(void);
void draw(void);
int tattrset(int);
void tnew(int, int);
void tresize(int, int);
void tsetdirtattr(int);
void ttyhangup(void);
int ttynew(const char *, char *, const char *, char **);
size_t ttyread(void);
void ttyresize(int, int);
void ttywrite(const char *, size_t, int);
void resettitle(void);
void selclear(void);
void selinit(void);
void selstart(int, int, int);
void selextend(int, int, int, int);
int selected(int, int);
char *getsel(void);
size_t utf8encode(Rune, char *);
void *xmalloc(size_t);
void *xrealloc(void *, size_t);
char *xstrdup(const char *);
extern char *utmp;
extern char *scroll;
extern char *stty_args;
extern char *vtiden;
extern wchar_t *worddelimiters;
extern int allowaltscreen;
extern int allowwindowops;
extern char *termname;
extern unsigned int tabspaces;
extern unsigned int defaultfg;
extern unsigned int defaultbg;
extern unsigned int defaultcs;

#define XEMBED_FOCUS_IN 4
#define XEMBED_FOCUS_OUT 5
#define IS_SET(flag) ((win.mode & (flag)) != 0)
#define TRUERED(x) (((x) & 0xff0000) >> 8)
#define TRUEGREEN(x) (((x) & 0xff00))
#define TRUEBLUE(x) (((x) & 0xff) << 8)
typedef XftDraw *Draw;
typedef XftColor Color;
typedef XftGlyphFontSpec GlyphFontSpec;
typedef struct
{
    int tw, th;
    int w, h;
    int ch;
    int cw;
    int mode;
    int cursor;
} TermWindow;
typedef struct
{
    Display *dpy;
    Colormap cmap;
    Window win;
    Drawable buf;
    GlyphFontSpec *specbuf;
    Atom xembed, wmdeletewin, netwmname, netwmiconname, netwmpid;
    struct
    {
        XIM xim;
        XIC xic;
        XPoint spot;
        XVaNestedList spotlist;
    } ime;
    Draw draw;
    Visual *vis;
    XSetWindowAttributes attrs;
    int scr;
    int isfixed;
    int l, t;
    int gm;
} XWindow;
typedef struct
{
    Atom xtarget;
    char *primary, *clipboard;
    struct timespec tclick1;
    struct timespec tclick2;
} XSelection;
#define Font Font_
typedef struct
{
    int height;
    int width;
    int ascent;
    int descent;
    int badslant;
    int badweight;
    short lbearing;
    short rbearing;
    XftFont *match;
    FcFontSet *set;
    FcPattern *pattern;
} Font;
typedef struct
{
    Color *col;
    size_t collen;
    Font font, bfont, ifont, ibfont;
    GC gc;
} DC;
static inline ushort sixd_to_16bit(int);
static int xmakeglyphfontspecs(XftGlyphFontSpec *, const Glyph *, int, int, int);
static void xdrawglyphfontspecs(const XftGlyphFontSpec *, Glyph, int, int, int);
static void xdrawglyph(Glyph, int, int);
static void xclear(int, int, int, int);
static int xgeommasktogravity(int);
static int ximopen(Display *);
static void ximinstantiate(Display *, XPointer, XPointer);
static void ximdestroy(XIM, XPointer, XPointer);
static int xicdestroy(XIC, XPointer, XPointer);
static void xinit(int, int);
static void cresize(int, int);
static void xresize(int, int);
static void xhints(void);
static int xloadcolor(int, const char *, Color *);
static int xloadfont(Font *, FcPattern *);
static void xloadfonts(const char *, double);
static void xunloadfont(Font *);
static void xunloadfonts(void);
static void xsetenv(void);
static void xseturgency(int);
static int evcol(XEvent *);
static int evrow(XEvent *);
static void expose(XEvent *);
static void visibility(XEvent *);
static void unmap(XEvent *);
static void kpress(XEvent *);
static void cmessage(XEvent *);
static void resize(XEvent *);
static void focus(XEvent *);
static uint buttonmask(uint);
static int mouseaction(XEvent *, uint);
static void brelease(XEvent *);
static void bpress(XEvent *);
static void bmotion(XEvent *);
static void propnotify(XEvent *);
static void selnotify(XEvent *);
static void selclear_(XEvent *);
static void selrequest(XEvent *);
static void setsel(char *, Time);
static void mousesel(XEvent *, int);
static void mousereport(XEvent *);
static char *kmap(KeySym, uint);
static int match(uint, uint);
static void run(void);
static void usage(void);
static void (*handler[LASTEvent])(XEvent *) = {
    [KeyPress] = kpress,
    [ClientMessage] = cmessage,
    [ConfigureNotify] = resize,
    [VisibilityNotify] = visibility,
    [UnmapNotify] = unmap,
    [Expose] = expose,
    [FocusIn] = focus,
    [FocusOut] = focus,
    [MotionNotify] = bmotion,
    [ButtonPress] = bpress,
    [ButtonRelease] = brelease,
    [SelectionNotify] = selnotify,
    [PropertyNotify] = propnotify,
    [SelectionRequest] = selrequest,
};
static DC dc;
static XWindow xw;
static XSelection xsel;
static TermWindow win;
enum
{
    FRC_NORMAL,
    FRC_ITALIC,
    FRC_BOLD,
    FRC_ITALICBOLD
};
typedef struct
{
    XftFont *font;
    int flags;
    Rune unicodep;
} Fontcache;
static Fontcache *frc = NULL;
static int frclen = 0;
static int frccap = 0;
static char *usedfont = NULL;
static double usedfontsize = 0;
static double defaultfontsize = 0;
static char *opt_class = NULL;
static char **opt_cmd = NULL;
static char *opt_embed = NULL;
static char *opt_font = NULL;
static char *opt_io = NULL;
static char *opt_line = NULL;
static char *opt_name = NULL;
static char *opt_title = NULL;
static uint buttons;
void clipcopy(const Arg *)
{
    Atom clipboard;
    free(xsel.clipboard);
    xsel.clipboard = NULL;
    if (xsel.primary != NULL)
    {
        xsel.clipboard = xstrdup(xsel.primary);
        clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
        XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
    }
}
void clippaste(const Arg *dummy)
{
    (void)dummy;
    Atom clipboard;
    clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
    XConvertSelection(xw.dpy, clipboard, xsel.xtarget, clipboard,
                      xw.win, CurrentTime);
}
void selpaste(const Arg *dummy)
{
    (void)dummy;
    XConvertSelection(xw.dpy, XA_PRIMARY, xsel.xtarget, XA_PRIMARY,
                      xw.win, CurrentTime);
}
void numlock(const Arg *dummy)
{
    (void)dummy;
    win.mode ^= MODE_NUMLOCK;
}
void zoom(const Arg *arg)
{
    Arg larg;
    larg.f = usedfontsize + arg->f;
    zoomabs(&larg);
}
void zoomabs(const Arg *arg)
{
    xunloadfonts();
    xloadfonts(usedfont, arg->f);
    cresize(0, 0);
    redraw();
    xhints();
}
void zoomreset(const Arg *arg)
{
    (void)arg;
    Arg larg;
    if (defaultfontsize > 0)
    {
        larg.f = defaultfontsize;
        zoomabs(&larg);
    }
}
void ttysend(const Arg *arg)
{
    ttywrite(arg->s, strlen(arg->s), 1);
}
int evcol(XEvent *e)
{
    int x = e->xbutton.x - borderpx;
    LIMIT(x, 0, win.tw - 1);
    return x / win.cw;
}
int evrow(XEvent *e)
{
    int y = e->xbutton.y - borderpx;
    LIMIT(y, 0, win.th - 1);
    return y / win.ch;
}
void mousesel(XEvent *e, int done)
{
    size_t type, seltype = SEL_REGULAR;
    uint state = e->xbutton.state & ~(Button1Mask | forcemousemod);
    for (type = 1; type < LEN(selmasks); ++type)
    {
        if (match(selmasks[type], state))
        {
            seltype = type;
            break;
        }
    }
    selextend(evcol(e), evrow(e), seltype, done);
    if (done)
        setsel(getsel(), e->xbutton.time);
}
void mousereport(XEvent *e)
{
    int len, btn, code;
    int x = evcol(e), y = evrow(e);
    int state = e->xbutton.state;
    char buf[40];
    static int ox, oy;
    if (e->type == MotionNotify)
    {
        if (x == ox && y == oy)
            return;
        if (!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
            return;
        if (IS_SET(MODE_MOUSEMOTION) && buttons == 0)
            return;
        for (btn = 1; btn <= 11 && !(buttons & (1 << (btn - 1))); btn++)
            ;
        code = 32;
    }
    else
    {
        btn = e->xbutton.button;
        if (btn < 1 || btn > 11)
            return;
        if (e->type == ButtonRelease)
        {
            if (IS_SET(MODE_MOUSEX10))
                return;
            if (btn == 4 || btn == 5)
                return;
        }
        code = 0;
    }
    ox = x;
    oy = y;
    if ((!IS_SET(MODE_MOUSESGR) && e->type == ButtonRelease) || btn == 12)
        code += 3;
    else if (btn >= 8)
        code += 128 + btn - 8;
    else if (btn >= 4)
        code += 64 + btn - 4;
    else
        code += btn - 1;
    if (!IS_SET(MODE_MOUSEX10))
    {
        code += ((state & ShiftMask) ? 4 : 0) + ((state & Mod1Mask) ? 8 : 0) + ((state & ControlMask) ? 16 : 0);
    }
    if (IS_SET(MODE_MOUSESGR))
    {
        len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
                       code, x + 1, y + 1,
                       e->type == ButtonRelease ? 'm' : 'M');
    }
    else if (x < 223 && y < 223)
    {
        len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
                       32 + code, 32 + x + 1, 32 + y + 1);
    }
    else
    {
        return;
    }
    ttywrite(buf, len, 0);
}
uint buttonmask(uint button)
{
    return button == Button1   ? Button1Mask
           : button == Button2 ? Button2Mask
           : button == Button3 ? Button3Mask
           : button == Button4 ? Button4Mask
           : button == Button5 ? Button5Mask
                               : 0;
}
int mouseaction(XEvent *e, uint release)
{
    MouseShortcut *ms;
    uint state = e->xbutton.state & ~buttonmask(e->xbutton.button);
    for (ms = mshortcuts; ms < mshortcuts + LEN(mshortcuts); ms++)
    {
        if (ms->release == release &&
            ms->button == e->xbutton.button &&
            (match(ms->mod, state) ||
             match(ms->mod, state & ~forcemousemod)))
        {
            ms->func(&(ms->arg));
            return 1;
        }
    }
    return 0;
}
void bpress(XEvent *e)
{
    int btn = e->xbutton.button;
    struct timespec now;
    int snap;
    if (1 <= btn && btn <= 11)
        buttons |= 1 << (btn - 1);
    if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod))
    {
        mousereport(e);
        return;
    }
    if (mouseaction(e, 0))
        return;
    if (btn == Button1)
    {
        clock_gettime(CLOCK_MONOTONIC, &now);
        if (TIMEDIFF(now, xsel.tclick2) <= tripleclicktimeout)
        {
            snap = SNAP_LINE;
        }
        else if (TIMEDIFF(now, xsel.tclick1) <= doubleclicktimeout)
        {
            snap = SNAP_WORD;
        }
        else
        {
            snap = 0;
        }
        xsel.tclick2 = xsel.tclick1;
        xsel.tclick1 = now;
        selstart(evcol(e), evrow(e), snap);
    }
}
void propnotify(XEvent *e)
{
    XPropertyEvent *xpev;
    Atom clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
    xpev = &e->xproperty;
    if (xpev->state == PropertyNewValue &&
        (xpev->atom == XA_PRIMARY ||
         xpev->atom == clipboard))
    {
        selnotify(e);
    }
}
void selnotify(XEvent *e)
{
    ulong nitems, ofs, rem;
    int format;
    uchar *data, *last, *repl;
    Atom type, incratom, property = None;
    incratom = XInternAtom(xw.dpy, "INCR", 0);
    ofs = 0;
    if (e->type == SelectionNotify)
        property = e->xselection.property;
    else if (e->type == PropertyNotify)
        property = e->xproperty.atom;
    if (property == None)
        return;
    do
    {
        if (XGetWindowProperty(xw.dpy, xw.win, property, ofs,
                               BUFSIZ / 4, False, AnyPropertyType,
                               &type, &format, &nitems, &rem,
                               &data))
        {
            fprintf(stderr, "Clipboard allocation failed\n");
            return;
        }
        if (e->type == PropertyNotify && nitems == 0 && rem == 0)
        {
            MODBIT(xw.attrs.event_mask, 0, PropertyChangeMask);
            XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
                                    &xw.attrs);
        }
        if (type == incratom)
        {
            MODBIT(xw.attrs.event_mask, 1, PropertyChangeMask);
            XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask,
                                    &xw.attrs);
            XDeleteProperty(xw.dpy, xw.win, (int)property);
            continue;
        }
        repl = data;
        last = data + nitems * format / 8;
        while ((repl = memchr(repl, '\n', last - repl)))
        {
            *repl++ = '\r';
        }
        if (IS_SET(MODE_BRCKTPASTE) && ofs == 0)
            ttywrite("\033[200~", 6, 0);
        ttywrite((char *)data, nitems * format / 8, 1);
        if (IS_SET(MODE_BRCKTPASTE) && rem == 0)
            ttywrite("\033[201~", 6, 0);
        XFree(data);
        ofs += nitems * format / 32;
    } while (rem > 0);
    XDeleteProperty(xw.dpy, xw.win, (int)property);
}
void xclipcopy(void)
{
    clipcopy(NULL);
}
void selclear_(XEvent *e)
{
    (void)e;
    selclear();
}
void selrequest(XEvent *e)
{
    XSelectionRequestEvent *xsre;
    XSelectionEvent xev;
    Atom xa_targets, string, clipboard;
    char *seltext;
    xsre = (XSelectionRequestEvent *)e;
    xev.type = SelectionNotify;
    xev.requestor = xsre->requestor;
    xev.selection = xsre->selection;
    xev.target = xsre->target;
    xev.time = xsre->time;
    if (xsre->property == None)
        xsre->property = xsre->target;
    xev.property = None;
    xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
    if (xsre->target == xa_targets)
    {
        string = xsel.xtarget;
        XChangeProperty(xsre->display, xsre->requestor, xsre->property,
                        XA_ATOM, 32, PropModeReplace,
                        (uchar *)&string, 1);
        xev.property = xsre->property;
    }
    else if (xsre->target == xsel.xtarget || xsre->target == XA_STRING)
    {
        clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
        if (xsre->selection == XA_PRIMARY)
        {
            seltext = xsel.primary;
        }
        else if (xsre->selection == clipboard)
        {
            seltext = xsel.clipboard;
        }
        else
        {
            fprintf(stderr,
                    "Unhandled clipboard selection 0x%lx\n",
                    xsre->selection);
            return;
        }
        if (seltext != NULL)
        {
            XChangeProperty(xsre->display, xsre->requestor,
                            xsre->property, xsre->target,
                            8, PropModeReplace,
                            (uchar *)seltext, strlen(seltext));
            xev.property = xsre->property;
        }
    }
    if (!XSendEvent(xsre->display, xsre->requestor, 1, 0, (XEvent *)&xev))
        fprintf(stderr, "Error sending SelectionNotify event\n");
}
void setsel(char *str, Time t)
{
    if (!str)
        return;
    free(xsel.primary);
    xsel.primary = str;
    XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
    if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
        selclear();
}
void xsetsel(char *str)
{
    setsel(str, CurrentTime);
}
void brelease(XEvent *e)
{
    int btn = e->xbutton.button;
    if (1 <= btn && btn <= 11)
        buttons &= ~(1 << (btn - 1));
    if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod))
    {
        mousereport(e);
        return;
    }
    if (mouseaction(e, 1))
        return;
    if (btn == Button1)
        mousesel(e, 1);
}
void bmotion(XEvent *e)
{
    if (IS_SET(MODE_MOUSE) && !(e->xbutton.state & forcemousemod))
    {
        mousereport(e);
        return;
    }
    mousesel(e, 0);
}
void cresize(int width, int height)
{
    int col, row;
    if (width != 0)
        win.w = width;
    if (height != 0)
        win.h = height;
    col = (win.w - 2 * borderpx) / win.cw;
    row = (win.h - 2 * borderpx) / win.ch;
    col = MAX(1, col);
    row = MAX(1, row);
    tresize(col, row);
    xresize(col, row);
    ttyresize(win.tw, win.th);
}
void xresize(int col, int row)
{
    win.tw = col * win.cw;
    win.th = row * win.ch;
    XFreePixmap(xw.dpy, xw.buf);
    xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
                           DefaultDepth(xw.dpy, xw.scr));
    XftDrawChange(xw.draw, xw.buf);
    xclear(0, 0, win.w, win.h);
    xw.specbuf = xrealloc(xw.specbuf, col * sizeof(GlyphFontSpec));
}
ushort
sixd_to_16bit(int x)
{
    return x == 0 ? 0 : 0x3737 + 0x2828 * x;
}
int xloadcolor(int i, const char *name, Color *ncolor)
{
    XRenderColor color = {.alpha = 0xffff};
    if (!name)
    {
        if (BETWEEN(i, 16, 255))
        {
            if (i < 6 * 6 * 6 + 16)
            {
                color.red = sixd_to_16bit(((i - 16) / 36) % 6);
                color.green = sixd_to_16bit(((i - 16) / 6) % 6);
                color.blue = sixd_to_16bit(((i - 16) / 1) % 6);
            }
            else
            {
                color.red = 0x0808 + 0x0a0a * (i - (6 * 6 * 6 + 16));
                color.green = color.blue = color.red;
            }
            return XftColorAllocValue(xw.dpy, xw.vis,
                                      xw.cmap, &color, ncolor);
        }
        else
            name = colorname[i];
    }
    return XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, ncolor);
}
void xloadcols(void)
{
    int i;
    static int loaded;
    Color *cp;
    if (loaded)
    {
        for (cp = dc.col; cp < &dc.col[dc.collen]; ++cp)
            XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
    }
    else
    {
        dc.collen = MAX(LEN(colorname), 256);
        dc.col = xmalloc(dc.collen * sizeof(Color));
    }
    for (i = 0; i < dc.collen; i++)
        if (!xloadcolor(i, NULL, &dc.col[i]))
        {
            if (colorname[i])
                die("could not allocate color '%s'\n", colorname[i]);
            else
                die("could not allocate color %d\n", i);
        }
    loaded = 1;
}
int xgetcolor(int x, unsigned char *r, unsigned char *g, unsigned char *b)
{
    if (!BETWEEN(x, 0, dc.collen - 1))
        return 1;
    *r = dc.col[x].color.red >> 8;
    *g = dc.col[x].color.green >> 8;
    *b = dc.col[x].color.blue >> 8;
    return 0;
}
int xsetcolorname(int x, const char *name)
{
    Color ncolor;
    if (!BETWEEN(x, 0, dc.collen - 1))
        return 1;
    if (!xloadcolor(x, name, &ncolor))
        return 1;
    XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
    dc.col[x] = ncolor;
    return 0;
}
void xclear(int x1, int y1, int x2, int y2)
{
    XftDrawRect(xw.draw,
                &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
                x1, y1, x2 - x1, y2 - y1);
}
void xhints(void)
{
    XClassHint class = {opt_name ? opt_name : termname,
                        opt_class ? opt_class : termname};
    XWMHints wm = {.flags = InputHint, .input = 1};
    XSizeHints *sizeh;
    sizeh = XAllocSizeHints();
    sizeh->flags = PSize | PResizeInc | PBaseSize | PMinSize;
    sizeh->height = win.h;
    sizeh->width = win.w;
    sizeh->height_inc = win.ch;
    sizeh->width_inc = win.cw;
    sizeh->base_height = 2 * borderpx;
    sizeh->base_width = 2 * borderpx;
    sizeh->min_height = win.ch + 2 * borderpx;
    sizeh->min_width = win.cw + 2 * borderpx;
    if (xw.isfixed)
    {
        sizeh->flags |= PMaxSize;
        sizeh->min_width = sizeh->max_width = win.w;
        sizeh->min_height = sizeh->max_height = win.h;
    }
    if (xw.gm & (XValue | YValue))
    {
        sizeh->flags |= USPosition | PWinGravity;
        sizeh->x = xw.l;
        sizeh->y = xw.t;
        sizeh->win_gravity = xgeommasktogravity(xw.gm);
    }
    XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
                     &class);
    XFree(sizeh);
}
int xgeommasktogravity(int mask)
{
    switch (mask & (XNegative | YNegative))
    {
    case 0:
        return NorthWestGravity;
    case XNegative:
        return NorthEastGravity;
    case YNegative:
        return SouthWestGravity;
    }
    return SouthEastGravity;
}
int xloadfont(Font *f, FcPattern *pattern)
{
    FcPattern *configured;
    FcPattern *match;
    FcResult result;
    XGlyphInfo extents;
    int wantattr, haveattr;
    configured = FcPatternDuplicate(pattern);
    if (!configured)
        return 1;
    FcConfigSubstitute(NULL, configured, FcMatchPattern);
    XftDefaultSubstitute(xw.dpy, xw.scr, configured);
    match = FcFontMatch(NULL, configured, &result);
    if (!match)
    {
        FcPatternDestroy(configured);
        return 1;
    }
    if (!(f->match = XftFontOpenPattern(xw.dpy, match)))
    {
        FcPatternDestroy(configured);
        FcPatternDestroy(match);
        return 1;
    }
    if ((XftPatternGetInteger(pattern, "slant", 0, &wantattr) ==
         XftResultMatch))
    {
        if ((XftPatternGetInteger(f->match->pattern, "slant", 0,
                                  &haveattr) != XftResultMatch) ||
            haveattr < wantattr)
        {
            f->badslant = 1;
            fputs("font slant does not match\n", stderr);
        }
    }
    if ((XftPatternGetInteger(pattern, "weight", 0, &wantattr) ==
         XftResultMatch))
    {
        if ((XftPatternGetInteger(f->match->pattern, "weight", 0,
                                  &haveattr) != XftResultMatch) ||
            haveattr != wantattr)
        {
            f->badweight = 1;
            fputs("font weight does not match\n", stderr);
        }
    }
    XftTextExtentsUtf8(xw.dpy, f->match,
                       (const FcChar8 *)ascii_printable,
                       strlen(ascii_printable), &extents);
    f->set = NULL;
    f->pattern = configured;
    f->ascent = f->match->ascent;
    f->descent = f->match->descent;
    f->lbearing = 0;
    f->rbearing = f->match->max_advance_width;
    f->height = f->ascent + f->descent;
    f->width = DIVCEIL(extents.xOff, strlen(ascii_printable));
    return 0;
}
void xloadfonts(const char *fontstr, double fontsize)
{
    FcPattern *pattern;
    double fontval;
    if (fontstr[0] == '-')
        pattern = XftXlfdParse(fontstr, False, False);
    else
        pattern = FcNameParse((const FcChar8 *)fontstr);
    if (!pattern)
        die("can't open font %s\n", fontstr);
    if (fontsize > 1)
    {
        FcPatternDel(pattern, FC_PIXEL_SIZE);
        FcPatternDel(pattern, FC_SIZE);
        FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
        usedfontsize = fontsize;
    }
    else
    {
        if (FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval) ==
            FcResultMatch)
        {
            usedfontsize = fontval;
        }
        else if (FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval) ==
                 FcResultMatch)
        {
            usedfontsize = -1;
        }
        else
        {
            FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
            usedfontsize = 12;
        }
        defaultfontsize = usedfontsize;
    }
    if (xloadfont(&dc.font, pattern))
        die("can't open font %s\n", fontstr);
    if (usedfontsize < 0)
    {
        FcPatternGetDouble(dc.font.match->pattern,
                           FC_PIXEL_SIZE, 0, &fontval);
        usedfontsize = fontval;
        if (fontsize == 0)
            defaultfontsize = fontval;
    }
    win.cw = ceilf(dc.font.width * cwscale);
    win.ch = ceilf(dc.font.height * chscale);
    FcPatternDel(pattern, FC_SLANT);
    FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
    if (xloadfont(&dc.ifont, pattern))
        die("can't open font %s\n", fontstr);
    FcPatternDel(pattern, FC_WEIGHT);
    FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
    if (xloadfont(&dc.ibfont, pattern))
        die("can't open font %s\n", fontstr);
    FcPatternDel(pattern, FC_SLANT);
    FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
    if (xloadfont(&dc.bfont, pattern))
        die("can't open font %s\n", fontstr);
    FcPatternDestroy(pattern);
}
void xunloadfont(Font *f)
{
    XftFontClose(xw.dpy, f->match);
    FcPatternDestroy(f->pattern);
    if (f->set)
        FcFontSetDestroy(f->set);
}
void xunloadfonts(void)
{
    while (frclen > 0)
        XftFontClose(xw.dpy, frc[--frclen].font);
    xunloadfont(&dc.font);
    xunloadfont(&dc.bfont);
    xunloadfont(&dc.ifont);
    xunloadfont(&dc.ibfont);
}
int ximopen(Display *dpy)
{
    (void)dpy;
    XIMCallback imdestroy = {.client_data = NULL, .callback = ximdestroy};
    XICCallback icdestroy = {.client_data = NULL, .callback = xicdestroy};
    xw.ime.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
    if (xw.ime.xim == NULL)
        return 0;
    if (XSetIMValues(xw.ime.xim, XNDestroyCallback, &imdestroy, NULL))
        fprintf(stderr, "XSetIMValues: "
                        "Could not set XNDestroyCallback.\n");
    xw.ime.spotlist = XVaCreateNestedList(0, XNSpotLocation, &xw.ime.spot,
                                          NULL);
    if (xw.ime.xic == NULL)
    {
        xw.ime.xic = XCreateIC(xw.ime.xim, XNInputStyle,
                               XIMPreeditNothing | XIMStatusNothing,
                               XNClientWindow, xw.win,
                               XNDestroyCallback, &icdestroy,
                               NULL);
    }
    if (xw.ime.xic == NULL)
        fprintf(stderr, "XCreateIC: Could not create input context.\n");
    return 1;
}
void ximinstantiate(Display *dpy, XPointer client, XPointer call)
{
    (void)client;
    (void)call;
    if (ximopen(dpy))
        XUnregisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
                                         ximinstantiate, NULL);
}
void ximdestroy(XIM xim, XPointer client, XPointer call)
{
    (void)xim;
    (void)client;
    (void)call;
    xw.ime.xim = NULL;
    XRegisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
                                   ximinstantiate, NULL);
    XFree(xw.ime.spotlist);
}
int xicdestroy(XIC xim, XPointer client, XPointer call)
{
    (void)xim;
    (void)client;
    (void)call;
    xw.ime.xic = NULL;
    return 1;
}
void xinit(int cols, int rows)
{
    XGCValues gcvalues;
    Cursor cursor;
    Window parent, root;
    pid_t thispid = getpid();
    XColor xmousefg, xmousebg;
    if (!(xw.dpy = XOpenDisplay(NULL)))
        die("can't open display\n");
    xw.scr = XDefaultScreen(xw.dpy);
    xw.vis = XDefaultVisual(xw.dpy, xw.scr);
    if (!FcInit())
        die("could not init fontconfig.\n");
    usedfont = (opt_font == NULL) ? font : opt_font;
    xloadfonts(usedfont, 0);
    xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
    xloadcols();
    win.w = 2 * borderpx + cols * win.cw;
    win.h = 2 * borderpx + rows * win.ch;
    if (xw.gm & XNegative)
        xw.l += DisplayWidth(xw.dpy, xw.scr) - win.w - 2;
    if (xw.gm & YNegative)
        xw.t += DisplayHeight(xw.dpy, xw.scr) - win.h - 2;
    xw.attrs.background_pixel = dc.col[defaultbg].pixel;
    xw.attrs.border_pixel = dc.col[defaultbg].pixel;
    xw.attrs.bit_gravity = NorthWestGravity;
    xw.attrs.event_mask = FocusChangeMask | KeyPressMask | KeyReleaseMask | ExposureMask | VisibilityChangeMask | StructureNotifyMask | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
    xw.attrs.colormap = xw.cmap;
    root = XRootWindow(xw.dpy, xw.scr);
    if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
        parent = root;
    xw.win = XCreateWindow(xw.dpy, root, xw.l, xw.t,
                           win.w, win.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
                           xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask | CWColormap, &xw.attrs);
    if (parent != root)
        XReparentWindow(xw.dpy, xw.win, parent, xw.l, xw.t);
    memset(&gcvalues, 0, sizeof(gcvalues));
    gcvalues.graphics_exposures = False;
    dc.gc = XCreateGC(xw.dpy, xw.win, GCGraphicsExposures,
                      &gcvalues);
    xw.buf = XCreatePixmap(xw.dpy, xw.win, win.w, win.h,
                           DefaultDepth(xw.dpy, xw.scr));
    XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
    XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, win.w, win.h);
    xw.specbuf = xmalloc(cols * sizeof(GlyphFontSpec));
    xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
    if (!ximopen(xw.dpy))
    {
        XRegisterIMInstantiateCallback(xw.dpy, NULL, NULL, NULL,
                                       ximinstantiate, NULL);
    }
    cursor = XCreateFontCursor(xw.dpy, mouseshape);
    XDefineCursor(xw.dpy, xw.win, cursor);
    if (XParseColor(xw.dpy, xw.cmap, colorname[mousefg], &xmousefg) == 0)
    {
        xmousefg.red = 0xffff;
        xmousefg.green = 0xffff;
        xmousefg.blue = 0xffff;
    }
    if (XParseColor(xw.dpy, xw.cmap, colorname[mousebg], &xmousebg) == 0)
    {
        xmousebg.red = 0x0000;
        xmousebg.green = 0x0000;
        xmousebg.blue = 0x0000;
    }
    XRecolorCursor(xw.dpy, cursor, &xmousefg, &xmousebg);
    xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
    xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
    xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
    xw.netwmiconname = XInternAtom(xw.dpy, "_NET_WM_ICON_NAME", False);
    XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
    xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
    XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
                    PropModeReplace, (uchar *)&thispid, 1);
    win.mode = MODE_NUMLOCK;
    resettitle();
    xhints();
    XMapWindow(xw.dpy, xw.win);
    XSync(xw.dpy, False);
    clock_gettime(CLOCK_MONOTONIC, &xsel.tclick1);
    clock_gettime(CLOCK_MONOTONIC, &xsel.tclick2);
    xsel.primary = NULL;
    xsel.clipboard = NULL;
    xsel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
    if (xsel.xtarget == None)
        xsel.xtarget = XA_STRING;
}
int xmakeglyphfontspecs(XftGlyphFontSpec *specs, const Glyph *glyphs, int len, int x, int y)
{
    float winx = borderpx + x * win.cw, winy = borderpx + y * win.ch, xp, yp;
    ushort mode, prevmode = USHRT_MAX;
    Font *font = &dc.font;
    int frcflags = FRC_NORMAL;
    float runewidth = win.cw;
    Rune rune;
    FT_UInt glyphidx;
    FcResult fcres;
    FcPattern *fcpattern, *fontpattern;
    FcFontSet *fcsets[] = {NULL};
    FcCharSet *fccharset;
    int i, f, numspecs = 0;
    for (i = 0, xp = winx, yp = winy + font->ascent; i < len; ++i)
    {
        rune = glyphs[i].u;
        mode = glyphs[i].mode;
        if (mode == ATTR_WDUMMY)
            continue;
        if (prevmode != mode)
        {
            prevmode = mode;
            font = &dc.font;
            frcflags = FRC_NORMAL;
            runewidth = win.cw * ((mode & ATTR_WIDE) ? 2.0f : 1.0f);
            if ((mode & ATTR_ITALIC) && (mode & ATTR_BOLD))
            {
                font = &dc.ibfont;
                frcflags = FRC_ITALICBOLD;
            }
            else if (mode & ATTR_ITALIC)
            {
                font = &dc.ifont;
                frcflags = FRC_ITALIC;
            }
            else if (mode & ATTR_BOLD)
            {
                font = &dc.bfont;
                frcflags = FRC_BOLD;
            }
            yp = winy + font->ascent;
        }
        glyphidx = XftCharIndex(xw.dpy, font->match, rune);
        if (glyphidx)
        {
            specs[numspecs].font = font->match;
            specs[numspecs].glyph = glyphidx;
            specs[numspecs].x = (short)xp;
            specs[numspecs].y = (short)yp;
            xp += runewidth;
            numspecs++;
            continue;
        }
        for (f = 0; f < frclen; f++)
        {
            glyphidx = XftCharIndex(xw.dpy, frc[f].font, rune);
            if (glyphidx && frc[f].flags == frcflags)
                break;
            if (!glyphidx && frc[f].flags == frcflags && frc[f].unicodep == rune)
            {
                break;
            }
        }
        if (f >= frclen)
        {
            if (!font->set)
                font->set = FcFontSort(0, font->pattern,
                                       1, 0, &fcres);
            fcsets[0] = font->set;
            fcpattern = FcPatternDuplicate(font->pattern);
            fccharset = FcCharSetCreate();
            FcCharSetAddChar(fccharset, rune);
            FcPatternAddCharSet(fcpattern, FC_CHARSET,
                                fccharset);
            FcPatternAddBool(fcpattern, FC_SCALABLE, 1);
            FcConfigSubstitute(0, fcpattern,
                               FcMatchPattern);
            FcDefaultSubstitute(fcpattern);
            fontpattern = FcFontSetMatch(0, fcsets, 1,
                                         fcpattern, &fcres);
            if (frclen >= frccap)
            {
                frccap += 16;
                frc = xrealloc(frc, frccap * sizeof(Fontcache));
            }
            frc[frclen].font = XftFontOpenPattern(xw.dpy,
                                                  fontpattern);
            if (!frc[frclen].font)
                die("XftFontOpenPattern failed seeking fallback font: %s\n",
                    strerror(errno));
            frc[frclen].flags = frcflags;
            frc[frclen].unicodep = rune;
            glyphidx = XftCharIndex(xw.dpy, frc[frclen].font, rune);
            f = frclen;
            frclen++;
            FcPatternDestroy(fcpattern);
            FcCharSetDestroy(fccharset);
        }
        specs[numspecs].font = frc[f].font;
        specs[numspecs].glyph = glyphidx;
        specs[numspecs].x = (short)xp;
        specs[numspecs].y = (short)yp;
        xp += runewidth;
        numspecs++;
    }
    return numspecs;
}
void xdrawglyphfontspecs(const XftGlyphFontSpec *specs, Glyph base, int len, int x, int y)
{
    int charlen = len * ((base.mode & ATTR_WIDE) ? 2 : 1);
    int winx = borderpx + x * win.cw, winy = borderpx + y * win.ch,
        width = charlen * win.cw;
    Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
    XRenderColor colfg, colbg;
    XRectangle r;
    if (base.mode & ATTR_ITALIC && base.mode & ATTR_BOLD)
    {
        if (dc.ibfont.badslant || dc.ibfont.badweight)
            base.fg = defaultattr;
    }
    else if ((base.mode & ATTR_ITALIC && dc.ifont.badslant) ||
             (base.mode & ATTR_BOLD && dc.bfont.badweight))
    {
        base.fg = defaultattr;
    }
    if (IS_TRUECOL(base.fg))
    {
        colfg.alpha = 0xffff;
        colfg.red = TRUERED(base.fg);
        colfg.green = TRUEGREEN(base.fg);
        colfg.blue = TRUEBLUE(base.fg);
        XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
        fg = &truefg;
    }
    else
    {
        fg = &dc.col[base.fg];
    }
    if (IS_TRUECOL(base.bg))
    {
        colbg.alpha = 0xffff;
        colbg.green = TRUEGREEN(base.bg);
        colbg.red = TRUERED(base.bg);
        colbg.blue = TRUEBLUE(base.bg);
        XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
        bg = &truebg;
    }
    else
    {
        bg = &dc.col[base.bg];
    }
    if ((base.mode & ATTR_BOLD_FAINT) == ATTR_BOLD && BETWEEN(base.fg, 0, 7))
        fg = &dc.col[base.fg + 8];
    if (IS_SET(MODE_REVERSE))
    {
        if (fg == &dc.col[defaultfg])
        {
            fg = &dc.col[defaultbg];
        }
        else
        {
            colfg.red = ~fg->color.red;
            colfg.green = ~fg->color.green;
            colfg.blue = ~fg->color.blue;
            colfg.alpha = fg->color.alpha;
            XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
                               &revfg);
            fg = &revfg;
        }
        if (bg == &dc.col[defaultbg])
        {
            bg = &dc.col[defaultfg];
        }
        else
        {
            colbg.red = ~bg->color.red;
            colbg.green = ~bg->color.green;
            colbg.blue = ~bg->color.blue;
            colbg.alpha = bg->color.alpha;
            XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
                               &revbg);
            bg = &revbg;
        }
    }
    if ((base.mode & ATTR_BOLD_FAINT) == ATTR_FAINT)
    {
        colfg.red = fg->color.red / 2;
        colfg.green = fg->color.green / 2;
        colfg.blue = fg->color.blue / 2;
        colfg.alpha = fg->color.alpha;
        XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
        fg = &revfg;
    }
    if (base.mode & ATTR_REVERSE)
    {
        temp = fg;
        fg = bg;
        bg = temp;
    }
    if (base.mode & ATTR_BLINK && win.mode & MODE_BLINK)
        fg = bg;
    if (base.mode & ATTR_INVISIBLE)
        fg = bg;
    if (x == 0)
    {
        xclear(0, (y == 0) ? 0 : winy, borderpx,
               winy + win.ch +
                   ((winy + win.ch >= borderpx + win.th) ? win.h : 0));
    }
    if (winx + width >= borderpx + win.tw)
    {
        xclear(winx + width, (y == 0) ? 0 : winy, win.w,
               ((winy + win.ch >= borderpx + win.th) ? win.h : (winy + win.ch)));
    }
    if (y == 0)
        xclear(winx, 0, winx + width, borderpx);
    if (winy + win.ch >= borderpx + win.th)
        xclear(winx, winy + win.ch, winx + width, win.h);
    XftDrawRect(xw.draw, bg, winx, winy, width, win.ch);
    r.x = 0;
    r.y = 0;
    r.height = win.ch;
    r.width = width;
    XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
    XftDrawGlyphFontSpec(xw.draw, fg, specs, len);
    if (base.mode & ATTR_UNDERLINE)
    {
        XftDrawRect(xw.draw, fg, winx, winy + dc.font.ascent * chscale + 1,
                    width, 1);
    }
    if (base.mode & ATTR_STRUCK)
    {
        XftDrawRect(xw.draw, fg, winx, winy + 2 * dc.font.ascent * chscale / 3,
                    width, 1);
    }
    XftDrawSetClip(xw.draw, 0);
}
void xdrawglyph(Glyph g, int x, int y)
{
    int numspecs;
    XftGlyphFontSpec spec;
    numspecs = xmakeglyphfontspecs(&spec, &g, 1, x, y);
    xdrawglyphfontspecs(&spec, g, numspecs, x, y);
}
void xdrawcursor(int cx, int cy, Glyph g, int ox, int oy, Glyph og)
{
    Color drawcol;
    if (selected(ox, oy))
        og.mode ^= ATTR_REVERSE;
    xdrawglyph(og, ox, oy);
    if (IS_SET(MODE_HIDE))
        return;
    g.mode &= ATTR_BOLD | ATTR_ITALIC | ATTR_UNDERLINE | ATTR_STRUCK | ATTR_WIDE;
    if (IS_SET(MODE_REVERSE))
    {
        g.mode |= ATTR_REVERSE;
        g.bg = defaultfg;
        if (selected(cx, cy))
        {
            drawcol = dc.col[defaultcs];
            g.fg = defaultrcs;
        }
        else
        {
            drawcol = dc.col[defaultrcs];
            g.fg = defaultcs;
        }
    }
    else
    {
        if (selected(cx, cy))
        {
            g.fg = defaultfg;
            g.bg = defaultrcs;
        }
        else
        {
            g.fg = defaultbg;
            g.bg = defaultcs;
        }
        drawcol = dc.col[g.bg];
    }
    if (IS_SET(MODE_FOCUSED))
    {
        switch (win.cursor)
        {
        case 7:
            g.u = 0x2603;
            __attribute__((fallthrough));
        case 0:
            __attribute__((fallthrough));
        case 1:
            __attribute__((fallthrough));
        case 2:
            xdrawglyph(g, cx, cy);
            break;
        case 3:
        case 4:
            XftDrawRect(xw.draw, &drawcol,
                        borderpx + cx * win.cw,
                        borderpx + (cy + 1) * win.ch -
                            cursorthickness,
                        win.cw, cursorthickness);
            break;
        case 5:
        case 6:
            XftDrawRect(xw.draw, &drawcol,
                        borderpx + cx * win.cw,
                        borderpx + cy * win.ch,
                        cursorthickness, win.ch);
            break;
        }
    }
    else
    {
        XftDrawRect(xw.draw, &drawcol,
                    borderpx + cx * win.cw,
                    borderpx + cy * win.ch,
                    win.cw - 1, 1);
        XftDrawRect(xw.draw, &drawcol,
                    borderpx + cx * win.cw,
                    borderpx + cy * win.ch,
                    1, win.ch - 1);
        XftDrawRect(xw.draw, &drawcol,
                    borderpx + (cx + 1) * win.cw - 1,
                    borderpx + cy * win.ch,
                    1, win.ch - 1);
        XftDrawRect(xw.draw, &drawcol,
                    borderpx + cx * win.cw,
                    borderpx + (cy + 1) * win.ch - 1,
                    win.cw, 1);
    }
}
void xsetenv(void)
{
    char buf[sizeof(long) * 8 + 1];
    snprintf(buf, sizeof(buf), "%lu", xw.win);
    setenv("WINDOWID", buf, 1);
}
void xseticontitle(char *p)
{
    XTextProperty prop;
    DEFAULT(p, opt_title);
    if (p[0] == '\0')
        p = opt_title;
    if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
                                    &prop) != Success)
        return;
    XSetWMIconName(xw.dpy, xw.win, &prop);
    XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmiconname);
    XFree(prop.value);
}
void xsettitle(char *p)
{
    XTextProperty prop;
    DEFAULT(p, opt_title);
    if (p[0] == '\0')
        p = opt_title;
    if (Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
                                    &prop) != Success)
        return;
    XSetWMName(xw.dpy, xw.win, &prop);
    XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
    XFree(prop.value);
}
int xstartdraw(void)
{
    return IS_SET(MODE_VISIBLE);
}
void xdrawline(Line line, int x1, int y1, int x2)
{
    int i, x, ox, numspecs;
    Glyph base, new;
    XftGlyphFontSpec *specs = xw.specbuf;
    numspecs = xmakeglyphfontspecs(specs, &line[x1], x2 - x1, x1, y1);
    i = ox = 0;
    for (x = x1; x < x2 && i < numspecs; x++)
    {
        new = line[x];
        if (new.mode == ATTR_WDUMMY)
            continue;
        if (selected(x, y1))
            new.mode ^= ATTR_REVERSE;
        if (i > 0 && ATTRCMP(base, new))
        {
            xdrawglyphfontspecs(specs, base, i, ox, y1);
            specs += i;
            numspecs -= i;
            i = 0;
        }
        if (i == 0)
        {
            ox = x;
            base = new;
        }
        i++;
    }
    if (i > 0)
        xdrawglyphfontspecs(specs, base, i, ox, y1);
}
void xfinishdraw(void)
{
    XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, win.w,
              win.h, 0, 0);
    XSetForeground(xw.dpy, dc.gc,
                   dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg].pixel);
}
void xximspot(int x, int y)
{
    if (xw.ime.xic == NULL)
        return;
    xw.ime.spot.x = borderpx + x * win.cw;
    xw.ime.spot.y = borderpx + (y + 1) * win.ch;
    XSetICValues(xw.ime.xic, XNPreeditAttributes, xw.ime.spotlist, NULL);
}
void expose(XEvent *)
{
    redraw();
}
void visibility(XEvent *ev)
{
    XVisibilityEvent *e = &ev->xvisibility;
    MODBIT(win.mode, e->state != VisibilityFullyObscured, MODE_VISIBLE);
}
void unmap(XEvent *)
{
    win.mode &= ~MODE_VISIBLE;
}
void xsetpointermotion(int set)
{
    MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
    XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
}
void xsetmode(int set, unsigned int flags)
{
    int mode = win.mode;
    MODBIT(win.mode, set, flags);
    if ((win.mode & MODE_REVERSE) != (mode & MODE_REVERSE))
        redraw();
}
int xsetcursor(int cursor)
{
    if (!BETWEEN(cursor, 0, 7))
        return 1;
    win.cursor = cursor;
    return 0;
}
void xseturgency(int add)
{
    XWMHints *h = XGetWMHints(xw.dpy, xw.win);
    MODBIT(h->flags, add, XUrgencyHint);
    XSetWMHints(xw.dpy, xw.win, h);
    XFree(h);
}
void xbell(void)
{
    if (!(IS_SET(MODE_FOCUSED)))
        xseturgency(1);
    if (bellvolume)
        XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
}
void focus(XEvent *ev)
{
    XFocusChangeEvent *e = &ev->xfocus;
    if (e->mode == NotifyGrab)
        return;
    if (ev->type == FocusIn)
    {
        if (xw.ime.xic)
            XSetICFocus(xw.ime.xic);
        win.mode |= MODE_FOCUSED;
        xseturgency(0);
        if (IS_SET(MODE_FOCUS))
            ttywrite("\033[I", 3, 0);
    }
    else
    {
        if (xw.ime.xic)
            XUnsetICFocus(xw.ime.xic);
        win.mode &= ~MODE_FOCUSED;
        if (IS_SET(MODE_FOCUS))
            ttywrite("\033[O", 3, 0);
    }
}
int match(uint mask, uint state)
{
    return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
}
char *
kmap(KeySym k, uint state)
{
    Key *kp;
    int i;
    for (i = 0; i < LEN(mappedkeys); i++)
    {
        if (mappedkeys[i] == k)
            break;
    }
    if (i == LEN(mappedkeys))
    {
        if ((k & 0xFFFF) < 0xFD00)
            return NULL;
    }
    for (kp = key; kp < key + LEN(key); kp++)
    {
        if (kp->k != k)
            continue;
        if (!match(kp->mask, state))
            continue;
        if (IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
            continue;
        if (IS_SET(MODE_NUMLOCK) && kp->appkey == 2)
            continue;
        if (IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
            continue;
        return kp->s;
    }
    return NULL;
}
void kpress(XEvent *ev)
{
    XKeyEvent *e = &ev->xkey;
    KeySym ksym = NoSymbol;
    char buf[64], *customkey;
    int len;
    Rune c;
    Status status;
    Shortcut *bp;
    if (IS_SET(MODE_KBDLOCK))
        return;
    if (xw.ime.xic)
    {
        len = XmbLookupString(xw.ime.xic, e, buf, sizeof buf, &ksym, &status);
        if (status == XBufferOverflow)
            return;
    }
    else
    {
        len = XLookupString(e, buf, sizeof buf, &ksym, NULL);
    }
    for (bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++)
    {
        if (ksym == bp->keysym && match(bp->mod, e->state))
        {
            bp->func(&(bp->arg));
            return;
        }
    }
    if ((customkey = kmap(ksym, e->state)))
    {
        ttywrite(customkey, strlen(customkey), 1);
        return;
    }
    if (len == 0)
        return;
    if (len == 1 && e->state & Mod1Mask)
    {
        if (IS_SET(MODE_8BIT))
        {
            if (*buf < 0177)
            {
                c = *buf | 0x80;
                len = utf8encode(c, buf);
            }
        }
        else
        {
            buf[1] = buf[0];
            buf[0] = '\033';
            len = 2;
        }
    }
    ttywrite(buf, len, 1);
}
void cmessage(XEvent *e)
{
    if (e->xclient.message_type == xw.xembed && e->xclient.format == 32)
    {
        if (e->xclient.data.l[1] == XEMBED_FOCUS_IN)
        {
            win.mode |= MODE_FOCUSED;
            xseturgency(0);
        }
        else if (e->xclient.data.l[1] == XEMBED_FOCUS_OUT)
        {
            win.mode &= ~MODE_FOCUSED;
        }
    }
    else if (e->xclient.data.l[0] == xw.wmdeletewin)
    {
        ttyhangup();
        exit(0);
    }
}
void resize(XEvent *e)
{
    if (e->xconfigure.width == win.w && e->xconfigure.height == win.h)
        return;
    cresize(e->xconfigure.width, e->xconfigure.height);
}
void run(void)
{
    XEvent ev;
    int w = win.w, h = win.h;
    fd_set rfd;
    int xfd = XConnectionNumber(xw.dpy), ttyfd, xev, drawing;
    struct timespec seltv, *tv, now, lastblink, trigger;
    double timeout;
    do
    {
        XNextEvent(xw.dpy, &ev);
        if (XFilterEvent(&ev, None))
            continue;
        if (ev.type == ConfigureNotify)
        {
            w = ev.xconfigure.width;
            h = ev.xconfigure.height;
        }
    } while (ev.type != MapNotify);
    ttyfd = ttynew(opt_line, shell, opt_io, opt_cmd);
    cresize(w, h);
    for (timeout = -1, drawing = 0, lastblink = (struct timespec){0};;)
    {
        FD_ZERO(&rfd);
        FD_SET(ttyfd, &rfd);
        FD_SET(xfd, &rfd);
        if (XPending(xw.dpy))
            timeout = 0;
        seltv.tv_sec = timeout / 1E3;
        seltv.tv_nsec = 1E6 * (timeout - 1E3 * seltv.tv_sec);
        tv = timeout >= 0 ? &seltv : NULL;
        if (pselect(MAX(xfd, ttyfd) + 1, &rfd, NULL, NULL, tv, NULL) < 0)
        {
            if (errno == EINTR)
                continue;
            die("select failed: %s\n", strerror(errno));
        }
        clock_gettime(CLOCK_MONOTONIC, &now);
        if (FD_ISSET(ttyfd, &rfd))
            ttyread();
        xev = 0;
        while (XPending(xw.dpy))
        {
            xev = 1;
            XNextEvent(xw.dpy, &ev);
            if (XFilterEvent(&ev, None))
                continue;
            if (handler[ev.type])
                (handler[ev.type])(&ev);
        }
        if (FD_ISSET(ttyfd, &rfd) || xev)
        {
            if (!drawing)
            {
                trigger = now;
                drawing = 1;
            }
            timeout = (maxlatency - TIMEDIFF(now, trigger)) / maxlatency * minlatency;
            if (timeout > 0)
                continue;
        }
        timeout = -1;
        if (blinktimeout && tattrset(ATTR_BLINK))
        {
            timeout = blinktimeout - TIMEDIFF(now, lastblink);
            if (timeout <= 0)
            {
                if (-timeout > blinktimeout)
                    win.mode |= MODE_BLINK;
                win.mode ^= MODE_BLINK;
                tsetdirtattr(ATTR_BLINK);
                lastblink = now;
                timeout = blinktimeout;
            }
        }
        draw();
        XFlush(xw.dpy);
        drawing = 0;
    }
}
void usage(void)
{
    die("usage: %s [-aiv] [-c class] [-f font] [-g geometry]"
        " [-n name] [-o file]\n"
        "          [-T title] [-t title] [-w windowid]"
        " [[-e] command [args ...]]\n"
        "       %s [-aiv] [-c class] [-f font] [-g geometry]"
        " [-n name] [-o file]\n"
        "          [-T title] [-t title] [-w windowid] -l line"
        " [stty_args ...]\n",
        argv0, argv0);
}
int main(int argc, char *argv[])
{
    xw.l = xw.t = 0;
    xw.isfixed = False;
    xsetcursor(cursorshape);
    ARGBEGIN
    {
    case 'a':
        allowaltscreen = 0;
        break;
    case 'c':
        opt_class = EARGF(usage());
        break;
    case 'e':
        if (argc > 0)
            --argc, ++argv;
        goto run;
    case 'f':
        opt_font = EARGF(usage());
        break;
    case 'g':
        xw.gm = XParseGeometry(EARGF(usage()),
                               &xw.l, &xw.t, &cols, &rows);
        break;
    case 'i':
        xw.isfixed = 1;
        break;
    case 'o':
        opt_io = EARGF(usage());
        break;
    case 'l':
        opt_line = EARGF(usage());
        break;
    case 'n':
        opt_name = EARGF(usage());
        break;
    case 't':
    case 'T':
        opt_title = EARGF(usage());
        break;
    case 'w':
        opt_embed = EARGF(usage());
        break;
    case 'v':
        die("%s "
            "\n",
            argv0);
        break;
    default:
        usage();
    }
    ARGEND;
run:
    if (argc > 0)
        opt_cmd = argv;
    if (!opt_title)
        opt_title = (opt_line || !opt_cmd) ? "st" : opt_cmd[0];
    setlocale(LC_CTYPE, "");
    XSetLocaleModifiers("");
    cols = MAX(cols, 1);
    rows = MAX(rows, 1);
    tnew(cols, rows);
    xinit(cols, rows);
    xsetenv();
    selinit();
    run();
    return 0;
}

#define UTF_INVALID 0xFFFD
#define UTF_SIZ 4
#define ESC_BUF_SIZ (128 * UTF_SIZ)
#define ESC_ARG_SIZ 16
#define STR_BUF_SIZ ESC_BUF_SIZ
#define STR_ARG_SIZ ESC_ARG_SIZ
#ifdef IS_SET
#undef IS_SET
#define IS_SET(flag) ((term.mode & (flag)) != 0)
#endif
#define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == 0x7f)
#define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
#define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
#define ISDELIM(u) (u && wcschr(worddelimiters, u))
enum term_mode
{
    MODE_WRAP = 1 << 0,
    MODE_INSERT = 1 << 1,
    MODE_ALTSCREEN = 1 << 2,
    MODE_CRLF = 1 << 3,
    MODE_ECHO = 1 << 4,
    MODE_PRINT = 1 << 5,
    MODE_UTF8 = 1 << 6,
};
enum cursor_movement
{
    CURSOR_SAVE,
    CURSOR_LOAD
};
enum cursor_state
{
    CURSOR_DEFAULT = 0,
    CURSOR_WRAPNEXT = 1,
    CURSOR_ORIGIN = 2
};
enum charset
{
    CS_GRAPHIC0,
    CS_GRAPHIC1,
    CS_UK,
    CS_USA,
    CS_MULTI,
    CS_GER,
    CS_FIN
};
enum escape_state
{
    ESC_START = 1,
    ESC_CSI = 2,
    ESC_STR = 4,
    ESC_ALTCHARSET = 8,
    ESC_STR_END = 16,
    ESC_TEST = 32,
    ESC_UTF8 = 64,
};
typedef struct
{
    Glyph attr;
    int x;
    int y;
    char state;
} TCursor;
typedef struct
{
    int mode;
    int type;
    int snap;
    struct
    {
        int x, y;
    } nb, ne, ob, oe;
    int alt;
} Selection;
typedef struct
{
    int row;
    int col;
    Line *line;
    Line *alt;
    int *dirty;
    TCursor c;
    int ocx;
    int ocy;
    int top;
    int bot;
    int mode;
    int esc;
    char trantbl[4];
    int charset;
    int icharset;
    int *tabs;
    Rune lastc;
} Term;
typedef struct
{
    char buf[ESC_BUF_SIZ];
    size_t len;
    char priv;
    int arg[ESC_ARG_SIZ];
    int narg;
    char mode[2];
} CSIEscape;
typedef struct
{
    char type;
    char *buf;
    size_t siz;
    size_t len;
    char *args[STR_ARG_SIZ];
    int narg;
} STREscape;
static void execsh(char *, char **);
static void stty(char **);
static void sigchld(int);
static void ttywriteraw(const char *, size_t);
static void csidump(void);
static void csihandle(void);
static void csiparse(void);
static void csireset(void);
static void osc_color_response(int, int, int);
static int eschandle(uchar);
static void strdump(void);
static void strhandle(void);
static void strparse(void);
static void strreset(void);
static void tprinter(char *, size_t);
static void tdumpsel(void);
static void tdumpline(int);
static void tdump(void);
static void tclearregion(int, int, int, int);
static void tcursor(int);
static void tdeletechar(int);
static void tdeleteline(int);
static void tinsertblank(int);
static void tinsertblankline(int);
static int tlinelen(int);
static void tmoveto(int, int);
static void tmoveato(int, int);
static void tnewline(int);
static void tputtab(int);
static void tputc(Rune);
static void treset(void);
static void tscrollup(int, int);
static void tscrolldown(int, int);
static void tsetattr(const int *, int);
static void tsetchar(Rune, const Glyph *, int, int);
static void tsetdirt(int, int);
static void tsetscroll(int, int);
static void tswapscreen(void);
static void tsetmode(int, int, const int *, int);
static int twrite(const char *, int, int);
static void tfulldirt(void);
static void tcontrolcode(uchar);
static void tdectest(char);
static void tdefutf8(char);
static int32_t tdefcolor(const int *, int *, int);
static void tdeftran(char);
static void tstrsequence(uchar);
static void drawregion(int, int, int, int);
static void selnormalize(void);
static void selscroll(int, int);
static void selsnap(int *, int *, int);
static size_t utf8decode(const char *, Rune *, size_t);
static Rune utf8decodebyte(char, size_t *);
static char utf8encodebyte(Rune, size_t);
static size_t utf8validate(Rune *, size_t);
static char *base64dec(const char *);
static char base64dec_getc(const char **);
static ssize_t xwrite(int, const char *, size_t);
static Term term;
static Selection sel;
static CSIEscape csiescseq;
static STREscape strescseq;
static int iofd = 1;
static int cmdfd;
static pid_t pid;
static const uchar utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
static const uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
static const Rune utfmin[UTF_SIZ + 1] = {0, 0, 0x80, 0x800, 0x10000};
static const Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
ssize_t
xwrite(int fd, const char *s, size_t len)
{
    size_t aux = len;
    ssize_t r;
    while (len > 0)
    {
        r = write(fd, s, len);
        if (r < 0)
            return r;
        len -= r;
        s += r;
    }
    return aux;
}
void *
xmalloc(size_t len)
{
    void *p;
    if (!(p = malloc(len)))
        die("malloc: %s\n", strerror(errno));
    return p;
}
void *
xrealloc(void *p, size_t len)
{
    if ((p = realloc(p, len)) == NULL)
        die("realloc: %s\n", strerror(errno));
    return p;
}
char *
xstrdup(const char *s)
{
    char *p;
    if ((p = strdup(s)) == NULL)
        die("strdup: %s\n", strerror(errno));
    return p;
}
size_t
utf8decode(const char *c, Rune *u, size_t clen)
{
    size_t i, j, len, type;
    Rune udecoded;
    *u = UTF_INVALID;
    if (!clen)
        return 0;
    udecoded = utf8decodebyte(c[0], &len);
    if (!BETWEEN(len, 1, UTF_SIZ))
        return 1;
    for (i = 1, j = 1; i < clen && j < len; ++i, ++j)
    {
        udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
        if (type != 0)
            return j;
    }
    if (j < len)
        return 0;
    *u = udecoded;
    utf8validate(u, len);
    return len;
}
Rune utf8decodebyte(char c, size_t *i)
{
    for (*i = 0; *i < LEN(utfmask); ++(*i))
        if (((uchar)c & utfmask[*i]) == utfbyte[*i])
            return (uchar)c & ~utfmask[*i];
    return 0;
}
size_t
utf8encode(Rune u, char *c)
{
    size_t len, i;
    len = utf8validate(&u, 0);
    if (len > UTF_SIZ)
        return 0;
    for (i = len - 1; i != 0; --i)
    {
        c[i] = utf8encodebyte(u, 0);
        u >>= 6;
    }
    c[0] = utf8encodebyte(u, len);
    return len;
}
char utf8encodebyte(Rune u, size_t i)
{
    return utfbyte[i] | (u & ~utfmask[i]);
}
size_t
utf8validate(Rune *u, size_t i)
{
    if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
        *u = UTF_INVALID;
    for (i = 1; *u > utfmax[i]; ++i)
        ;
    return i;
}
char base64dec_getc(const char **src)
{
    while (**src && !isprint((unsigned char)**src))
        (*src)++;
    return **src ? *((*src)++) : '=';
}
char *
base64dec(const char *src)
{
    size_t in_len = strlen(src);
    char *result, *dst;
    static const char base64_digits[256] = {
        [43] = 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51};
    if (in_len % 4)
        in_len += 4 - (in_len % 4);
    result = dst = xmalloc(in_len / 4 * 3 + 1);
    while (*src)
    {
        int a = base64_digits[(unsigned char)base64dec_getc(&src)];
        int b = base64_digits[(unsigned char)base64dec_getc(&src)];
        int c = base64_digits[(unsigned char)base64dec_getc(&src)];
        int d = base64_digits[(unsigned char)base64dec_getc(&src)];
        if (a == -1 || b == -1)
            break;
        *dst++ = (a << 2) | ((b & 0x30) >> 4);
        if (c == -1)
            break;
        *dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
        if (d == -1)
            break;
        *dst++ = ((c & 0x03) << 6) | d;
    }
    *dst = '\0';
    return result;
}
void selinit(void)
{
    sel.mode = SEL_IDLE;
    sel.snap = 0;
    sel.ob.x = -1;
}
int tlinelen(int y)
{
    int i = term.col;
    if (term.line[y][i - 1].mode & ATTR_WRAP)
        return i;
    while (i > 0 && term.line[y][i - 1].u == ' ')
        --i;
    return i;
}
void selstart(int col, int row, int snap)
{
    selclear();
    sel.mode = SEL_EMPTY;
    sel.type = SEL_REGULAR;
    sel.alt = IS_SET(MODE_ALTSCREEN);
    sel.snap = snap;
    sel.oe.x = sel.ob.x = col;
    sel.oe.y = sel.ob.y = row;
    selnormalize();
    if (sel.snap != 0)
        sel.mode = SEL_READY;
    tsetdirt(sel.nb.y, sel.ne.y);
}
void selextend(int col, int row, int type, int done)
{
    int oldey, oldex, oldsby, oldsey, oldtype;
    if (sel.mode == SEL_IDLE)
        return;
    if (done && sel.mode == SEL_EMPTY)
    {
        selclear();
        return;
    }
    oldey = sel.oe.y;
    oldex = sel.oe.x;
    oldsby = sel.nb.y;
    oldsey = sel.ne.y;
    oldtype = sel.type;
    sel.oe.x = col;
    sel.oe.y = row;
    selnormalize();
    sel.type = type;
    if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY)
        tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
    sel.mode = done ? SEL_IDLE : SEL_READY;
}
void selnormalize(void)
{
    int i;
    if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y)
    {
        sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
        sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
    }
    else
    {
        sel.nb.x = MIN(sel.ob.x, sel.oe.x);
        sel.ne.x = MAX(sel.ob.x, sel.oe.x);
    }
    sel.nb.y = MIN(sel.ob.y, sel.oe.y);
    sel.ne.y = MAX(sel.ob.y, sel.oe.y);
    selsnap(&sel.nb.x, &sel.nb.y, -1);
    selsnap(&sel.ne.x, &sel.ne.y, +1);
    if (sel.type == SEL_RECTANGULAR)
        return;
    i = tlinelen(sel.nb.y);
    if (i < sel.nb.x)
        sel.nb.x = i;
    if (tlinelen(sel.ne.y) <= sel.ne.x)
        sel.ne.x = term.col - 1;
}
int selected(int x, int y)
{
    if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
        sel.alt != IS_SET(MODE_ALTSCREEN))
        return 0;
    if (sel.type == SEL_RECTANGULAR)
        return BETWEEN(y, sel.nb.y, sel.ne.y) && BETWEEN(x, sel.nb.x, sel.ne.x);
    return BETWEEN(y, sel.nb.y, sel.ne.y) && (y != sel.nb.y || x >= sel.nb.x) && (y != sel.ne.y || x <= sel.ne.x);
}
void selsnap(int *x, int *y, int direction)
{
    int newx, newy, xt, yt;
    int delim, prevdelim;
    const Glyph *gp, *prevgp;
    switch (sel.snap)
    {
    case SNAP_WORD:
        prevgp = &term.line[*y][*x];
        prevdelim = ISDELIM(prevgp->u);
        for (;;)
        {
            newx = *x + direction;
            newy = *y;
            if (!BETWEEN(newx, 0, term.col - 1))
            {
                newy += direction;
                newx = (newx + term.col) % term.col;
                if (!BETWEEN(newy, 0, term.row - 1))
                    break;
                if (direction > 0)
                    yt = *y, xt = *x;
                else
                    yt = newy, xt = newx;
                if (!(term.line[yt][xt].mode & ATTR_WRAP))
                    break;
            }
            if (newx >= tlinelen(newy))
                break;
            gp = &term.line[newy][newx];
            delim = ISDELIM(gp->u);
            if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim || (delim && gp->u != prevgp->u)))
                break;
            *x = newx;
            *y = newy;
            prevgp = gp;
            prevdelim = delim;
        }
        break;
    case SNAP_LINE:
        *x = (direction < 0) ? 0 : term.col - 1;
        if (direction < 0)
        {
            for (; *y > 0; *y += direction)
            {
                if (!(term.line[*y - 1][term.col - 1].mode & ATTR_WRAP))
                {
                    break;
                }
            }
        }
        else if (direction > 0)
        {
            for (; *y < term.row - 1; *y += direction)
            {
                if (!(term.line[*y][term.col - 1].mode & ATTR_WRAP))
                {
                    break;
                }
            }
        }
        break;
    }
}
char *
getsel(void)
{
    char *str, *ptr;
    int y, bufsize, lastx, linelen;
    const Glyph *gp, *last;
    if (sel.ob.x == -1)
        return NULL;
    bufsize = (term.col + 1) * (sel.ne.y - sel.nb.y + 1) * UTF_SIZ;
    ptr = str = xmalloc(bufsize);
    for (y = sel.nb.y; y <= sel.ne.y; y++)
    {
        if ((linelen = tlinelen(y)) == 0)
        {
            *ptr++ = '\n';
            continue;
        }
        if (sel.type == SEL_RECTANGULAR)
        {
            gp = &term.line[y][sel.nb.x];
            lastx = sel.ne.x;
        }
        else
        {
            gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
            lastx = (sel.ne.y == y) ? sel.ne.x : term.col - 1;
        }
        last = &term.line[y][MIN(lastx, linelen - 1)];
        while (last >= gp && last->u == ' ')
            --last;
        for (; gp <= last; ++gp)
        {
            if (gp->mode & ATTR_WDUMMY)
                continue;
            ptr += utf8encode(gp->u, ptr);
        }
        if ((y < sel.ne.y || lastx >= linelen) &&
            (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
            *ptr++ = '\n';
    }
    *ptr = 0;
    return str;
}
void selclear(void)
{
    if (sel.ob.x == -1)
        return;
    sel.mode = SEL_IDLE;
    sel.ob.x = -1;
    tsetdirt(sel.nb.y, sel.ne.y);
}
void die(const char *errstr, ...)
{
    va_list ap;
    va_start(ap, errstr);
    vfprintf(stderr, errstr, ap);
    va_end(ap);
    exit(1);
}
void execsh(char *cmd, char **args)
{
    char *sh, *prog, *arg;
    const struct passwd *pw;
    errno = 0;
    if ((pw = getpwuid(getuid())) == NULL)
    {
        if (errno)
            die("getpwuid: %s\n", strerror(errno));
        else
            die("who are you?\n");
    }
    if ((sh = getenv("SHELL")) == NULL)
        sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;
    if (args)
    {
        prog = args[0];
        arg = NULL;
    }
    else if (scroll)
    {
        prog = scroll;
        arg = utmp ? utmp : sh;
    }
    else if (utmp)
    {
        prog = utmp;
        arg = NULL;
    }
    else
    {
        prog = sh;
        arg = NULL;
    }
    DEFAULT(args, ((char *[]){prog, arg, NULL}));
    unsetenv("COLUMNS");
    unsetenv("LINES");
    unsetenv("TERMCAP");
    setenv("LOGNAME", pw->pw_name, 1);
    setenv("USER", pw->pw_name, 1);
    setenv("SHELL", sh, 1);
    setenv("HOME", pw->pw_dir, 1);
    setenv("TERM", termname, 1);
    signal(SIGCHLD, SIG_DFL);
    signal(SIGHUP, SIG_DFL);
    signal(SIGINT, SIG_DFL);
    signal(SIGQUIT, SIG_DFL);
    signal(SIGTERM, SIG_DFL);
    signal(SIGALRM, SIG_DFL);
    execvp(prog, args);
    _exit(1);
}
void sigchld(int)
{
    int stat;
    pid_t p;
    if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
        die("waiting for pid %hd failed: %s\n", pid, strerror(errno));
    if (pid != p)
        return;
    if (WIFEXITED(stat) && WEXITSTATUS(stat))
        die("child exited with status %d\n", WEXITSTATUS(stat));
    else if (WIFSIGNALED(stat))
        die("child terminated due to signal %d\n", WTERMSIG(stat));
    _exit(0);
}
void stty(char **args)
{
    char cmd[_POSIX_ARG_MAX], **p, *q, *s;
    size_t n, siz;
    if ((n = strlen(stty_args)) > sizeof(cmd) - 1)
        die("incorrect stty parameters\n");
    memcpy(cmd, stty_args, n);
    q = cmd + n;
    siz = sizeof(cmd) - n;
    for (p = args; p && (s = *p); ++p)
    {
        if ((n = strlen(s)) > siz - 1)
            die("stty parameter length too long\n");
        *q++ = ' ';
        memcpy(q, s, n);
        q += n;
        siz -= n + 1;
    }
    *q = '\0';
    if (system(cmd) != 0)
        perror("Couldn't call stty");
}
int ttynew(const char *line, char *cmd, const char *out, char **args)
{
    int m, s;
    if (out)
    {
        term.mode |= MODE_PRINT;
        iofd = (!strcmp(out, "-")) ? 1 : open(out, O_WRONLY | O_CREAT, 0666);
        if (iofd < 0)
        {
            fprintf(stderr, "Error opening %s:%s\n",
                    out, strerror(errno));
        }
    }
    if (line)
    {
        if ((cmdfd = open(line, O_RDWR)) < 0)
            die("open line '%s' failed: %s\n",
                line, strerror(errno));
        dup2(cmdfd, 0);
        stty(args);
        return cmdfd;
    }
    if (openpty(&m, &s, NULL, NULL, NULL) < 0)
        die("openpty failed: %s\n", strerror(errno));
    switch (pid = fork())
    {
    case -1:
        die("fork failed: %s\n", strerror(errno));
        break;
    case 0:
        close(iofd);
        close(m);
        setsid();
        dup2(s, 0);
        dup2(s, 1);
        dup2(s, 2);
        if (ioctl(s, TIOCSCTTY, NULL) < 0)
            die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
        if (s > 2)
            close(s);
#ifdef __OpenBSD__
        if (pledge("stdio getpw proc exec", NULL) == -1)
            die("pledge\n");
#endif
        execsh(cmd, args);
        break;
    default:
#ifdef __OpenBSD__
        if (pledge("stdio rpath tty proc", NULL) == -1)
            die("pledge\n");
#endif
        close(s);
        cmdfd = m;
        signal(SIGCHLD, sigchld);
        break;
    }
    return cmdfd;
}
size_t
ttyread(void)
{
    static char buf[BUFSIZ];
    static int buflen = 0;
    int ret, written;
    ret = read(cmdfd, buf + buflen, LEN(buf) - buflen);
    switch (ret)
    {
    case 0:
        exit(0);
    case -1:
        die("couldn't read from shell: %s\n", strerror(errno));
        __attribute__((fallthrough));
    default:
        buflen += ret;
        written = twrite(buf, buflen, 0);
        buflen -= written;
        if (buflen > 0)
            memmove(buf, buf + written, buflen);
        return ret;
    }
}
void ttywrite(const char *s, size_t n, int may_echo)
{
    const char *next;
    if (may_echo && IS_SET(MODE_ECHO))
        twrite(s, n, 1);
    if (!IS_SET(MODE_CRLF))
    {
        ttywriteraw(s, n);
        return;
    }
    while (n > 0)
    {
        if (*s == '\r')
        {
            next = s + 1;
            ttywriteraw("\r\n", 2);
        }
        else
        {
            next = memchr(s, '\r', n);
            DEFAULT(next, s + n);
            ttywriteraw(s, next - s);
        }
        n -= next - s;
        s = next;
    }
}
void ttywriteraw(const char *s, size_t n)
{
    fd_set wfd, rfd;
    ssize_t r;
    size_t lim = 256;
    while (n > 0)
    {
        FD_ZERO(&wfd);
        FD_ZERO(&rfd);
        FD_SET(cmdfd, &wfd);
        FD_SET(cmdfd, &rfd);
        if (pselect(cmdfd + 1, &rfd, &wfd, NULL, NULL, NULL) < 0)
        {
            if (errno == EINTR)
                continue;
            die("select failed: %s\n", strerror(errno));
        }
        if (FD_ISSET(cmdfd, &wfd))
        {
            if ((r = write(cmdfd, s, (n < lim) ? n : lim)) < 0)
                goto write_error;
            if (r < n)
            {
                if (n < lim)
                    lim = ttyread();
                n -= r;
                s += r;
            }
            else
            {
                break;
            }
        }
        if (FD_ISSET(cmdfd, &rfd))
            lim = ttyread();
    }
    return;
write_error:
    die("write error on tty: %s\n", strerror(errno));
}
void ttyresize(int tw, int th)
{
    struct winsize w;
    w.ws_row = term.row;
    w.ws_col = term.col;
    w.ws_xpixel = tw;
    w.ws_ypixel = th;
    if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
        fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
}
void ttyhangup(void)
{
    kill(pid, SIGHUP);
}
int tattrset(int attr)
{
    int i, j;
    for (i = 0; i < term.row - 1; i++)
    {
        for (j = 0; j < term.col - 1; j++)
        {
            if (term.line[i][j].mode & attr)
                return 1;
        }
    }
    return 0;
}
void tsetdirt(int top, int bot)
{
    int i;
    LIMIT(top, 0, term.row - 1);
    LIMIT(bot, 0, term.row - 1);
    for (i = top; i <= bot; i++)
        term.dirty[i] = 1;
}
void tsetdirtattr(int attr)
{
    int i, j;
    for (i = 0; i < term.row - 1; i++)
    {
        for (j = 0; j < term.col - 1; j++)
        {
            if (term.line[i][j].mode & attr)
            {
                tsetdirt(i, i);
                break;
            }
        }
    }
}
void tfulldirt(void)
{
    tsetdirt(0, term.row - 1);
}
void tcursor(int mode)
{
    static TCursor c[2];
    int alt = IS_SET(MODE_ALTSCREEN);
    if (mode == CURSOR_SAVE)
    {
        c[alt] = term.c;
    }
    else if (mode == CURSOR_LOAD)
    {
        term.c = c[alt];
        tmoveto(c[alt].x, c[alt].y);
    }
}
void treset(void)
{
    uint i;
    term.c = (TCursor){{.mode = ATTR_NULL,
                        .fg = defaultfg,
                        .bg = defaultbg},
                       .x = 0,
                       .y = 0,
                       .state = CURSOR_DEFAULT};
    memset(term.tabs, 0, term.col * sizeof(*term.tabs));
    for (i = tabspaces; i < term.col; i += tabspaces)
        term.tabs[i] = 1;
    term.top = 0;
    term.bot = term.row - 1;
    term.mode = MODE_WRAP | MODE_UTF8;
    memset(term.trantbl, CS_USA, sizeof(term.trantbl));
    term.charset = 0;
    for (i = 0; i < 2; i++)
    {
        tmoveto(0, 0);
        tcursor(CURSOR_SAVE);
        tclearregion(0, 0, term.col - 1, term.row - 1);
        tswapscreen();
    }
}
void tnew(int col, int row)
{
    term = (Term){.c = {.attr = {.fg = defaultfg, .bg = defaultbg}}};
    tresize(col, row);
    treset();
}
void tswapscreen(void)
{
    Line *tmp = term.line;
    term.line = term.alt;
    term.alt = tmp;
    term.mode ^= MODE_ALTSCREEN;
    tfulldirt();
}
void tscrolldown(int orig, int n)
{
    int i;
    Line temp;
    LIMIT(n, 0, term.bot - orig + 1);
    tsetdirt(orig, term.bot - n);
    tclearregion(0, term.bot - n + 1, term.col - 1, term.bot);
    for (i = term.bot; i >= orig + n; i--)
    {
        temp = term.line[i];
        term.line[i] = term.line[i - n];
        term.line[i - n] = temp;
    }
    selscroll(orig, n);
}
void tscrollup(int orig, int n)
{
    int i;
    Line temp;
    LIMIT(n, 0, term.bot - orig + 1);
    tclearregion(0, orig, term.col - 1, orig + n - 1);
    tsetdirt(orig + n, term.bot);
    for (i = orig; i <= term.bot - n; i++)
    {
        temp = term.line[i];
        term.line[i] = term.line[i + n];
        term.line[i + n] = temp;
    }
    selscroll(orig, -n);
}
void selscroll(int orig, int n)
{
    if (sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN))
        return;
    if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot))
    {
        selclear();
    }
    else if (BETWEEN(sel.nb.y, orig, term.bot))
    {
        sel.ob.y += n;
        sel.oe.y += n;
        if (sel.ob.y < term.top || sel.ob.y > term.bot ||
            sel.oe.y < term.top || sel.oe.y > term.bot)
        {
            selclear();
        }
        else
        {
            selnormalize();
        }
    }
}
void tnewline(int first_col)
{
    int y = term.c.y;
    if (y == term.bot)
    {
        tscrollup(term.top, 1);
    }
    else
    {
        y++;
    }
    tmoveto(first_col ? 0 : term.c.x, y);
}
void csiparse(void)
{
    char *p = csiescseq.buf, *np;
    long int v;
    int sep = ';';
    csiescseq.narg = 0;
    if (*p == '?')
    {
        csiescseq.priv = 1;
        p++;
    }
    csiescseq.buf[csiescseq.len] = '\0';
    while (p < csiescseq.buf + csiescseq.len)
    {
        np = NULL;
        v = strtol(p, &np, 10);
        if (np == p)
            v = 0;
        if (v == LONG_MAX || v == LONG_MIN)
            v = -1;
        csiescseq.arg[csiescseq.narg++] = v;
        p = np;
        if (sep == ';' && *p == ':')
            sep = ':';
        if (*p != sep || csiescseq.narg == ESC_ARG_SIZ)
            break;
        p++;
    }
    csiescseq.mode[0] = *p++;
    csiescseq.mode[1] = (p < csiescseq.buf + csiescseq.len) ? *p : '\0';
}
void tmoveato(int x, int y)
{
    tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top : 0));
}
void tmoveto(int x, int y)
{
    int miny, maxy;
    if (term.c.state & CURSOR_ORIGIN)
    {
        miny = term.top;
        maxy = term.bot;
    }
    else
    {
        miny = 0;
        maxy = term.row - 1;
    }
    term.c.state &= ~CURSOR_WRAPNEXT;
    term.c.x = LIMIT(x, 0, term.col - 1);
    term.c.y = LIMIT(y, miny, maxy);
}
void tsetchar(Rune u, const Glyph *attr, int x, int y)
{
    static const char *vt100_0[62] = {
        "↑",
        "↓",
        "→",
        "←",
        "█",
        "▚",
        "☃",
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        0,
        " ",
        "◆",
        "▒",
        "␉",
        "␌",
        "␍",
        "␊",
        "°",
        "±",
        "␤",
        "␋",
        "┘",
        "┐",
        "┌",
        "└",
        "┼",
        "⎺",
        "⎻",
        "─",
        "⎼",
        "⎽",
        "├",
        "┤",
        "┴",
        "┬",
        "│",
        "≤",
        "≥",
        "π",
        "≠",
        "£",
        "·",
    };
    if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
        BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
        utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
    if (term.line[y][x].mode & ATTR_WIDE)
    {
        if (x + 1 < term.col)
        {
            term.line[y][x + 1].u = ' ';
            term.line[y][x + 1].mode &= ~ATTR_WDUMMY;
        }
    }
    else if (term.line[y][x].mode & ATTR_WDUMMY)
    {
        term.line[y][x - 1].u = ' ';
        term.line[y][x - 1].mode &= ~ATTR_WIDE;
    }
    term.dirty[y] = 1;
    term.line[y][x] = *attr;
    term.line[y][x].u = u;
}
void tclearregion(int x1, int y1, int x2, int y2)
{
    int x, y, temp;
    Glyph *gp;
    if (x1 > x2)
        temp = x1, x1 = x2, x2 = temp;
    if (y1 > y2)
        temp = y1, y1 = y2, y2 = temp;
    LIMIT(x1, 0, term.col - 1);
    LIMIT(x2, 0, term.col - 1);
    LIMIT(y1, 0, term.row - 1);
    LIMIT(y2, 0, term.row - 1);
    for (y = y1; y <= y2; y++)
    {
        term.dirty[y] = 1;
        for (x = x1; x <= x2; x++)
        {
            gp = &term.line[y][x];
            if (selected(x, y))
                selclear();
            gp->fg = term.c.attr.fg;
            gp->bg = term.c.attr.bg;
            gp->mode = 0;
            gp->u = ' ';
        }
    }
}
void tdeletechar(int n)
{
    int dst, src, size;
    Glyph *line;
    LIMIT(n, 0, term.col - term.c.x);
    dst = term.c.x;
    src = term.c.x + n;
    size = term.col - src;
    line = term.line[term.c.y];
    memmove(&line[dst], &line[src], size * sizeof(Glyph));
    tclearregion(term.col - n, term.c.y, term.col - 1, term.c.y);
}
void tinsertblank(int n)
{
    int dst, src, size;
    Glyph *line;
    LIMIT(n, 0, term.col - term.c.x);
    dst = term.c.x + n;
    src = term.c.x;
    size = term.col - dst;
    line = term.line[term.c.y];
    memmove(&line[dst], &line[src], size * sizeof(Glyph));
    tclearregion(src, term.c.y, dst - 1, term.c.y);
}
void tinsertblankline(int n)
{
    if (BETWEEN(term.c.y, term.top, term.bot))
        tscrolldown(term.c.y, n);
}
void tdeleteline(int n)
{
    if (BETWEEN(term.c.y, term.top, term.bot))
        tscrollup(term.c.y, n);
}
int32_t
tdefcolor(const int *attr, int *npar, int l)
{
    int32_t idx = -1;
    uint r, g, b;
    switch (attr[*npar + 1])
    {
    case 2:
        if (*npar + 4 >= l)
        {
            fprintf(stderr,
                    "erresc(38): Incorrect number of parameters (%d)\n",
                    *npar);
            break;
        }
        r = attr[*npar + 2];
        g = attr[*npar + 3];
        b = attr[*npar + 4];
        *npar += 4;
        if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
            fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
                    r, g, b);
        else
            idx = TRUECOLOR(r, g, b);
        break;
    case 5:
        if (*npar + 2 >= l)
        {
            fprintf(stderr,
                    "erresc(38): Incorrect number of parameters (%d)\n",
                    *npar);
            break;
        }
        *npar += 2;
        if (!BETWEEN(attr[*npar], 0, 255))
            fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
        else
            idx = attr[*npar];
        break;
    case 0:
    case 1:
    case 3:
    case 4:
    default:
        fprintf(stderr,
                "erresc(38): gfx attr %d unknown\n", attr[*npar]);
        break;
    }
    return idx;
}
void tsetattr(const int *attr, int l)
{
    int i;
    int32_t idx;
    for (i = 0; i < l; i++)
    {
        switch (attr[i])
        {
        case 0:
            term.c.attr.mode &= ~(
                ATTR_BOLD |
                ATTR_FAINT |
                ATTR_ITALIC |
                ATTR_UNDERLINE |
                ATTR_BLINK |
                ATTR_REVERSE |
                ATTR_INVISIBLE |
                ATTR_STRUCK);
            term.c.attr.fg = defaultfg;
            term.c.attr.bg = defaultbg;
            break;
        case 1:
            term.c.attr.mode |= ATTR_BOLD;
            break;
        case 2:
            term.c.attr.mode |= ATTR_FAINT;
            break;
        case 3:
            term.c.attr.mode |= ATTR_ITALIC;
            break;
        case 4:
            term.c.attr.mode |= ATTR_UNDERLINE;
            break;
        case 5:
        case 6:
            term.c.attr.mode |= ATTR_BLINK;
            break;
        case 7:
            term.c.attr.mode |= ATTR_REVERSE;
            break;
        case 8:
            term.c.attr.mode |= ATTR_INVISIBLE;
            break;
        case 9:
            term.c.attr.mode |= ATTR_STRUCK;
            break;
        case 22:
            term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
            break;
        case 23:
            term.c.attr.mode &= ~ATTR_ITALIC;
            break;
        case 24:
            term.c.attr.mode &= ~ATTR_UNDERLINE;
            break;
        case 25:
            term.c.attr.mode &= ~ATTR_BLINK;
            break;
        case 27:
            term.c.attr.mode &= ~ATTR_REVERSE;
            break;
        case 28:
            term.c.attr.mode &= ~ATTR_INVISIBLE;
            break;
        case 29:
            term.c.attr.mode &= ~ATTR_STRUCK;
            break;
        case 38:
            if ((idx = tdefcolor(attr, &i, l)) >= 0)
                term.c.attr.fg = idx;
            break;
        case 39:
            term.c.attr.fg = defaultfg;
            break;
        case 48:
            if ((idx = tdefcolor(attr, &i, l)) >= 0)
                term.c.attr.bg = idx;
            break;
        case 49:
            term.c.attr.bg = defaultbg;
            break;
        case 58:
            tdefcolor(attr, &i, l);
            break;
        default:
            if (BETWEEN(attr[i], 30, 37))
            {
                term.c.attr.fg = attr[i] - 30;
            }
            else if (BETWEEN(attr[i], 40, 47))
            {
                term.c.attr.bg = attr[i] - 40;
            }
            else if (BETWEEN(attr[i], 90, 97))
            {
                term.c.attr.fg = attr[i] - 90 + 8;
            }
            else if (BETWEEN(attr[i], 100, 107))
            {
                term.c.attr.bg = attr[i] - 100 + 8;
            }
            else
            {
                fprintf(stderr,
                        "erresc(default): gfx attr %d unknown\n",
                        attr[i]);
                csidump();
            }
            break;
        }
    }
}
void tsetscroll(int t, int b)
{
    int temp;
    LIMIT(t, 0, term.row - 1);
    LIMIT(b, 0, term.row - 1);
    if (t > b)
    {
        temp = t;
        t = b;
        b = temp;
    }
    term.top = t;
    term.bot = b;
}
void tsetmode(int priv, int set, const int *args, int narg)
{
    int alt;
    const int *lim;
    for (lim = args + narg; args < lim; ++args)
    {
        if (priv)
        {
            switch (*args)
            {
            case 1:
                xsetmode(set, MODE_APPCURSOR);
                break;
            case 5:
                xsetmode(set, MODE_REVERSE);
                break;
            case 6:
                MODBIT(term.c.state, set, CURSOR_ORIGIN);
                tmoveato(0, 0);
                break;
            case 7:
                MODBIT(term.mode, set, MODE_WRAP);
                break;
            case 0:
            case 2:
            case 3:
            case 4:
            case 8:
            case 18:
            case 19:
            case 42:
            case 12:
                break;
            case 25:
                xsetmode(!set, MODE_HIDE);
                break;
            case 9:
                xsetpointermotion(0);
                xsetmode(0, MODE_MOUSE);
                xsetmode(set, MODE_MOUSEX10);
                break;
            case 1000:
                xsetpointermotion(0);
                xsetmode(0, MODE_MOUSE);
                xsetmode(set, MODE_MOUSEBTN);
                break;
            case 1002:
                xsetpointermotion(0);
                xsetmode(0, MODE_MOUSE);
                xsetmode(set, MODE_MOUSEMOTION);
                break;
            case 1003:
                xsetpointermotion(set);
                xsetmode(0, MODE_MOUSE);
                xsetmode(set, MODE_MOUSEMANY);
                break;
            case 1004:
                xsetmode(set, MODE_FOCUS);
                break;
            case 1006:
                xsetmode(set, MODE_MOUSESGR);
                break;
            case 1034:
                xsetmode(set, MODE_8BIT);
                break;
            case 1049:
                if (!allowaltscreen)
                    break;
                else
                    tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
                __attribute__((fallthrough));
            case 47:
                __attribute__((fallthrough));
            case 1047:
                if (!allowaltscreen)
                    break;
                alt = IS_SET(MODE_ALTSCREEN);
                if (alt)
                {
                    tclearregion(0, 0, term.col - 1,
                                 term.row - 1);
                }
                if (set ^ alt)
                    tswapscreen();
                if (*args != 1049)
                    break;
                __attribute__((fallthrough));
            case 1048:
                tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
                break;
            case 2004:
                xsetmode(set, MODE_BRCKTPASTE);
                break;
            case 1001:
            case 1005:
            case 1015:
                break;
            default:
                fprintf(stderr,
                        "erresc: unknown private set/reset mode %d\n",
                        *args);
                break;
            }
        }
        else
        {
            switch (*args)
            {
            case 0:
                break;
            case 2:
                xsetmode(set, MODE_KBDLOCK);
                break;
            case 4:
                MODBIT(term.mode, set, MODE_INSERT);
                break;
            case 12:
                MODBIT(term.mode, !set, MODE_ECHO);
                break;
            case 20:
                MODBIT(term.mode, set, MODE_CRLF);
                break;
            default:
                fprintf(stderr,
                        "erresc: unknown set/reset mode %d\n",
                        *args);
                break;
            }
        }
    }
}
void csihandle(void)
{
    char buf[40];
    int len;
    switch (csiescseq.mode[0])
    {
    default:
    unknown:
        fprintf(stderr, "erresc: unknown csi ");
        csidump();
        break;
    case '@':
        DEFAULT(csiescseq.arg[0], 1);
        tinsertblank(csiescseq.arg[0]);
        break;
    case 'A':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveto(term.c.x, term.c.y - csiescseq.arg[0]);
        break;
    case 'B':
    case 'e':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveto(term.c.x, term.c.y + csiescseq.arg[0]);
        break;
    case 'i':
        switch (csiescseq.arg[0])
        {
        case 0:
            tdump();
            break;
        case 1:
            tdumpline(term.c.y);
            break;
        case 2:
            tdumpsel();
            break;
        case 4:
            term.mode &= ~MODE_PRINT;
            break;
        case 5:
            term.mode |= MODE_PRINT;
            break;
        }
        break;
    case 'c':
        if (csiescseq.arg[0] == 0)
            ttywrite(vtiden, strlen(vtiden), 0);
        break;
    case 'b':
        LIMIT(csiescseq.arg[0], 1, 65535);
        if (term.lastc)
            while (csiescseq.arg[0]-- > 0)
                tputc(term.lastc);
        break;
    case 'C':
    case 'a':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveto(term.c.x + csiescseq.arg[0], term.c.y);
        break;
    case 'D':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveto(term.c.x - csiescseq.arg[0], term.c.y);
        break;
    case 'E':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveto(0, term.c.y + csiescseq.arg[0]);
        break;
    case 'F':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveto(0, term.c.y - csiescseq.arg[0]);
        break;
    case 'g':
        switch (csiescseq.arg[0])
        {
        case 0:
            term.tabs[term.c.x] = 0;
            break;
        case 3:
            memset(term.tabs, 0, term.col * sizeof(*term.tabs));
            break;
        default:
            goto unknown;
        }
        break;
    case 'G':
    case '`':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveto(csiescseq.arg[0] - 1, term.c.y);
        break;
    case 'H':
    case 'f':
        DEFAULT(csiescseq.arg[0], 1);
        DEFAULT(csiescseq.arg[1], 1);
        tmoveato(csiescseq.arg[1] - 1, csiescseq.arg[0] - 1);
        break;
    case 'I':
        DEFAULT(csiescseq.arg[0], 1);
        tputtab(csiescseq.arg[0]);
        break;
    case 'J':
        switch (csiescseq.arg[0])
        {
        case 0:
            tclearregion(term.c.x, term.c.y, term.col - 1, term.c.y);
            if (term.c.y < term.row - 1)
            {
                tclearregion(0, term.c.y + 1, term.col - 1,
                             term.row - 1);
            }
            break;
        case 1:
            if (term.c.y > 0)
                tclearregion(0, 0, term.col - 1, term.c.y - 1);
            tclearregion(0, term.c.y, term.c.x, term.c.y);
            break;
        case 2:
            tclearregion(0, 0, term.col - 1, term.row - 1);
            break;
        default:
            goto unknown;
        }
        break;
    case 'K':
        switch (csiescseq.arg[0])
        {
        case 0:
            tclearregion(term.c.x, term.c.y, term.col - 1,
                         term.c.y);
            break;
        case 1:
            tclearregion(0, term.c.y, term.c.x, term.c.y);
            break;
        case 2:
            tclearregion(0, term.c.y, term.col - 1, term.c.y);
            break;
        }
        break;
    case 'S':
        if (csiescseq.priv)
            break;
        DEFAULT(csiescseq.arg[0], 1);
        tscrollup(term.top, csiescseq.arg[0]);
        break;
    case 'T':
        DEFAULT(csiescseq.arg[0], 1);
        tscrolldown(term.top, csiescseq.arg[0]);
        break;
    case 'L':
        DEFAULT(csiescseq.arg[0], 1);
        tinsertblankline(csiescseq.arg[0]);
        break;
    case 'l':
        tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
        break;
    case 'M':
        DEFAULT(csiescseq.arg[0], 1);
        tdeleteline(csiescseq.arg[0]);
        break;
    case 'X':
        DEFAULT(csiescseq.arg[0], 1);
        tclearregion(term.c.x, term.c.y,
                     term.c.x + csiescseq.arg[0] - 1, term.c.y);
        break;
    case 'P':
        DEFAULT(csiescseq.arg[0], 1);
        tdeletechar(csiescseq.arg[0]);
        break;
    case 'Z':
        DEFAULT(csiescseq.arg[0], 1);
        tputtab(-csiescseq.arg[0]);
        break;
    case 'd':
        DEFAULT(csiescseq.arg[0], 1);
        tmoveato(term.c.x, csiescseq.arg[0] - 1);
        break;
    case 'h':
        tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
        break;
    case 'm':
        tsetattr(csiescseq.arg, csiescseq.narg);
        break;
    case 'n':
        switch (csiescseq.arg[0])
        {
        case 5:
            ttywrite("\033[0n", sizeof("\033[0n") - 1, 0);
            break;
        case 6:
            len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
                           term.c.y + 1, term.c.x + 1);
            ttywrite(buf, len, 0);
            break;
        default:
            goto unknown;
        }
        break;
    case 'r':
        if (csiescseq.priv)
        {
            goto unknown;
        }
        else
        {
            DEFAULT(csiescseq.arg[0], 1);
            DEFAULT(csiescseq.arg[1], term.row);
            tsetscroll(csiescseq.arg[0] - 1, csiescseq.arg[1] - 1);
            tmoveato(0, 0);
        }
        break;
    case 's':
        tcursor(CURSOR_SAVE);
        break;
    case 'u':
        if (csiescseq.priv)
        {
            goto unknown;
        }
        else
        {
            tcursor(CURSOR_LOAD);
        }
        break;
    case ' ':
        switch (csiescseq.mode[1])
        {
        case 'q':
            if (xsetcursor(csiescseq.arg[0]))
                goto unknown;
            break;
        default:
            goto unknown;
        }
        break;
    }
}
void csidump(void)
{
    size_t i;
    uint c;
    fprintf(stderr, "ESC[");
    for (i = 0; i < csiescseq.len; i++)
    {
        c = csiescseq.buf[i] & 0xff;
        if (isprint(c))
        {
            putc(c, stderr);
        }
        else if (c == '\n')
        {
            fprintf(stderr, "(\\n)");
        }
        else if (c == '\r')
        {
            fprintf(stderr, "(\\r)");
        }
        else if (c == 0x1b)
        {
            fprintf(stderr, "(\\e)");
        }
        else
        {
            fprintf(stderr, "(%02x)", c);
        }
    }
    putc('\n', stderr);
}
void csireset(void)
{
    memset(&csiescseq, 0, sizeof(csiescseq));
}
void osc_color_response(int num, int index, int is_osc4)
{
    int n;
    char buf[32];
    unsigned char r, g, b;
    if (xgetcolor(is_osc4 ? num : index, &r, &g, &b))
    {
        fprintf(stderr, "erresc: failed to fetch %s color %d\n",
                is_osc4 ? "osc4" : "osc",
                is_osc4 ? num : index);
        return;
    }
    n = snprintf(buf, sizeof buf, "\033]%s%d;rgb:%02x%02x/%02x%02x/%02x%02x\007",
                 is_osc4 ? "4;" : "", num, r, r, g, g, b, b);
    if (n < 0 || n >= sizeof(buf))
    {
        fprintf(stderr, "error: %s while printing %s response\n",
                n < 0 ? "snprintf failed" : "truncation occurred",
                is_osc4 ? "osc4" : "osc");
    }
    else
    {
        ttywrite(buf, n, 1);
    }
}
void strhandle(void)
{
    char *p = NULL, *dec;
    int j, narg, par;
    const struct
    {
        int idx;
        char *str;
    } osc_table[] = {
        {defaultfg, "foreground"},
        {defaultbg, "background"},
        {defaultcs, "cursor"}};
    term.esc &= ~(ESC_STR_END | ESC_STR);
    strparse();
    par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;
    switch (strescseq.type)
    {
    case ']':
        switch (par)
        {
        case 0:
            if (narg > 1)
            {
                xsettitle(strescseq.args[1]);
                xseticontitle(strescseq.args[1]);
            }
            return;
        case 1:
            if (narg > 1)
                xseticontitle(strescseq.args[1]);
            return;
        case 2:
            if (narg > 1)
                xsettitle(strescseq.args[1]);
            return;
        case 52:
            if (narg > 2 && allowwindowops)
            {
                dec = base64dec(strescseq.args[2]);
                if (dec)
                {
                    xsetsel(dec);
                    xclipcopy();
                }
                else
                {
                    fprintf(stderr, "erresc: invalid base64\n");
                }
            }
            return;
        case 10:
        case 11:
        case 12:
            if (narg < 2)
                break;
            p = strescseq.args[1];
            if ((j = par - 10) < 0 || j >= LEN(osc_table))
                break;
            if (!strcmp(p, "?"))
            {
                osc_color_response(par, osc_table[j].idx, 0);
            }
            else if (xsetcolorname(osc_table[j].idx, p))
            {
                fprintf(stderr, "erresc: invalid %s color: %s\n",
                        osc_table[j].str, p);
            }
            else
            {
                tfulldirt();
            }
            return;
        case 4:
            if (narg < 3)
                break;
            p = strescseq.args[2];
            __attribute__((fallthrough));
        case 104:
            j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
            if (p && !strcmp(p, "?"))
            {
                osc_color_response(j, 0, 1);
            }
            else if (xsetcolorname(j, p))
            {
                if (par == 104 && narg <= 1)
                {
                    xloadcols();
                    return;
                }
                fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",
                        j, p ? p : "(null)");
            }
            else
            {
                tfulldirt();
            }
            return;
        case 110:
        case 111:
        case 112:
            if (narg != 1)
                break;
            if ((j = par - 110) < 0 || j >= LEN(osc_table))
                break;
            if (xsetcolorname(osc_table[j].idx, NULL))
            {
                fprintf(stderr, "erresc: %s color not found\n", osc_table[j].str);
            }
            else
            {
                tfulldirt();
            }
            return;
        }
        break;
    case 'k':
        xsettitle(strescseq.args[0]);
        return;
    case 'P':
    case '_':
    case '^':
        return;
    }
    fprintf(stderr, "erresc: unknown str ");
    strdump();
}
void strparse(void)
{
    int c;
    char *p = strescseq.buf;
    strescseq.narg = 0;
    strescseq.buf[strescseq.len] = '\0';
    if (*p == '\0')
        return;
    while (strescseq.narg < STR_ARG_SIZ)
    {
        strescseq.args[strescseq.narg++] = p;
        while ((c = *p) != ';' && c != '\0')
            ++p;
        if (c == '\0')
            return;
        *p++ = '\0';
    }
}
void strdump(void)
{
    size_t i;
    uint c;
    fprintf(stderr, "ESC%c", strescseq.type);
    for (i = 0; i < strescseq.len; i++)
    {
        c = strescseq.buf[i] & 0xff;
        if (c == '\0')
        {
            putc('\n', stderr);
            return;
        }
        else if (isprint(c))
        {
            putc(c, stderr);
        }
        else if (c == '\n')
        {
            fprintf(stderr, "(\\n)");
        }
        else if (c == '\r')
        {
            fprintf(stderr, "(\\r)");
        }
        else if (c == 0x1b)
        {
            fprintf(stderr, "(\\e)");
        }
        else
        {
            fprintf(stderr, "(%02x)", c);
        }
    }
    fprintf(stderr, "ESC\\\n");
}
void strreset(void)
{
    strescseq = (STREscape){
        .buf = xrealloc(strescseq.buf, STR_BUF_SIZ),
        .siz = STR_BUF_SIZ,
    };
}
void sendbreak(const Arg *)
{
    if (tcsendbreak(cmdfd, 0))
        perror("Error sending break");
}
void tprinter(char *s, size_t len)
{
    if (iofd != -1 && xwrite(iofd, s, len) < 0)
    {
        perror("Error writing to output file");
        close(iofd);
        iofd = -1;
    }
}
void toggleprinter(const Arg *)
{
    term.mode ^= MODE_PRINT;
}
void printscreen(const Arg *)
{
    tdump();
}
void printsel(const Arg *)
{
    tdumpsel();
}
void tdumpsel(void)
{
    char *ptr;
    if ((ptr = getsel()))
    {
        tprinter(ptr, strlen(ptr));
        free(ptr);
    }
}
void tdumpline(int n)
{
    char buf[UTF_SIZ];
    const Glyph *bp, *end;
    bp = &term.line[n][0];
    end = &bp[MIN(tlinelen(n), term.col) - 1];
    if (bp != end || bp->u != ' ')
    {
        for (; bp <= end; ++bp)
            tprinter(buf, utf8encode(bp->u, buf));
    }
    tprinter("\n", 1);
}
void tdump(void)
{
    int i;
    for (i = 0; i < term.row; ++i)
        tdumpline(i);
}
void tputtab(int n)
{
    uint x = term.c.x;
    if (n > 0)
    {
        while (x < term.col && n--)
            for (++x; x < term.col && !term.tabs[x]; ++x)
                ;
    }
    else if (n < 0)
    {
        while (x > 0 && n++)
            for (--x; x > 0 && !term.tabs[x]; --x)
                ;
    }
    term.c.x = LIMIT(x, 0, term.col - 1);
}
void tdefutf8(char ascii)
{
    if (ascii == 'G')
        term.mode |= MODE_UTF8;
    else if (ascii == '@')
        term.mode &= ~MODE_UTF8;
}
void tdeftran(char ascii)
{
    static char cs[] = "0B";
    static int vcs[] = {CS_GRAPHIC0, CS_USA};
    char *p;
    if ((p = strchr(cs, ascii)) == NULL)
    {
        fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
    }
    else
    {
        term.trantbl[term.icharset] = vcs[p - cs];
    }
}
void tdectest(char c)
{
    int x, y;
    if (c == '8')
    {
        for (x = 0; x < term.col; ++x)
        {
            for (y = 0; y < term.row; ++y)
                tsetchar('E', &term.c.attr, x, y);
        }
    }
}
void tstrsequence(uchar c)
{
    switch (c)
    {
    case 0x90:
        c = 'P';
        break;
    case 0x9f:
        c = '_';
        break;
    case 0x9e:
        c = '^';
        break;
    case 0x9d:
        c = ']';
        break;
    }
    strreset();
    strescseq.type = c;
    term.esc |= ESC_STR;
}
void tcontrolcode(uchar ascii)
{
    switch (ascii)
    {
    case '\t':
        tputtab(1);
        return;
    case '\b':
        tmoveto(term.c.x - 1, term.c.y);
        return;
    case '\r':
        tmoveto(0, term.c.y);
        return;
    case '\f':
    case '\v':
    case '\n':
        tnewline(IS_SET(MODE_CRLF));
        return;
    case '\a':
        if (term.esc & ESC_STR_END)
        {
            strhandle();
        }
        else
        {
            xbell();
        }
        break;
    case '\033':
        csireset();
        term.esc &= ~(ESC_CSI | ESC_ALTCHARSET | ESC_TEST);
        term.esc |= ESC_START;
        return;
    case '\016':
    case '\017':
        term.charset = 1 - (ascii - '\016');
        return;
    case '\032':
        tsetchar('?', &term.c.attr, term.c.x, term.c.y);
        __attribute__((fallthrough));
    case '\030':
        csireset();
        break;
    case '\005':
    case '\000':
    case '\021':
    case '\023':
    case 0177:
        return;
    case 0x80:
    case 0x81:
    case 0x82:
    case 0x83:
    case 0x84:
        break;
    case 0x85:
        tnewline(1);
        break;
    case 0x86:
    case 0x87:
        break;
    case 0x88:
        term.tabs[term.c.x] = 1;
        break;
    case 0x89:
    case 0x8a:
    case 0x8b:
    case 0x8c:
    case 0x8d:
    case 0x8e:
    case 0x8f:
    case 0x91:
    case 0x92:
    case 0x93:
    case 0x94:
    case 0x95:
    case 0x96:
    case 0x97:
    case 0x98:
    case 0x99:
        break;
    case 0x9a:
        ttywrite(vtiden, strlen(vtiden), 0);
        break;
    case 0x9b:
    case 0x9c:
        break;
    case 0x90:
    case 0x9d:
    case 0x9e:
    case 0x9f:
        tstrsequence(ascii);
        return;
    }
    term.esc &= ~(ESC_STR_END | ESC_STR);
}
int eschandle(uchar ascii)
{
    switch (ascii)
    {
    case '[':
        term.esc |= ESC_CSI;
        return 0;
    case '#':
        term.esc |= ESC_TEST;
        return 0;
    case '%':
        term.esc |= ESC_UTF8;
        return 0;
    case 'P':
    case '_':
    case '^':
    case ']':
    case 'k':
        tstrsequence(ascii);
        return 0;
    case 'n':
    case 'o':
        term.charset = 2 + (ascii - 'n');
        break;
    case '(':
    case ')':
    case '*':
    case '+':
        term.icharset = ascii - '(';
        term.esc |= ESC_ALTCHARSET;
        return 0;
    case 'D':
        if (term.c.y == term.bot)
        {
            tscrollup(term.top, 1);
        }
        else
        {
            tmoveto(term.c.x, term.c.y + 1);
        }
        break;
    case 'E':
        tnewline(1);
        break;
    case 'H':
        term.tabs[term.c.x] = 1;
        break;
    case 'M':
        if (term.c.y == term.top)
        {
            tscrolldown(term.top, 1);
        }
        else
        {
            tmoveto(term.c.x, term.c.y - 1);
        }
        break;
    case 'Z':
        ttywrite(vtiden, strlen(vtiden), 0);
        break;
    case 'c':
        treset();
        resettitle();
        xloadcols();
        xsetmode(0, MODE_HIDE);
        break;
    case '=':
        xsetmode(1, MODE_APPKEYPAD);
        break;
    case '>':
        xsetmode(0, MODE_APPKEYPAD);
        break;
    case '7':
        tcursor(CURSOR_SAVE);
        break;
    case '8':
        tcursor(CURSOR_LOAD);
        break;
    case '\\':
        if (term.esc & ESC_STR_END)
            strhandle();
        break;
    default:
        fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
                (uchar)ascii, isprint(ascii) ? ascii : '.');
        break;
    }
    return 1;
}
void tputc(Rune u)
{
    char c[UTF_SIZ];
    int control;
    int width, len;
    Glyph *gp;
    control = ISCONTROL(u);
    if (u < 127 || !IS_SET(MODE_UTF8))
    {
        c[0] = u;
        width = len = 1;
    }
    else
    {
        len = utf8encode(u, c);
        if (!control && (width = wcwidth(u)) == -1)
            width = 1;
    }
    if (IS_SET(MODE_PRINT))
        tprinter(c, len);
    if (term.esc & ESC_STR)
    {
        if (u == '\a' || u == 030 || u == 032 || u == 033 ||
            ISCONTROLC1(u))
        {
            term.esc &= ~(ESC_START | ESC_STR);
            term.esc |= ESC_STR_END;
            goto check_control_code;
        }
        if (strescseq.len + len >= strescseq.siz)
        {
            if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
                return;
            strescseq.siz *= 2;
            strescseq.buf = xrealloc(strescseq.buf, strescseq.siz);
        }
        memmove(&strescseq.buf[strescseq.len], c, len);
        strescseq.len += len;
        return;
    }
check_control_code:
    if (control)
    {
        if (IS_SET(MODE_UTF8) && ISCONTROLC1(u))
            return;
        tcontrolcode(u);
        if (!term.esc)
            term.lastc = 0;
        return;
    }
    else if (term.esc & ESC_START)
    {
        if (term.esc & ESC_CSI)
        {
            csiescseq.buf[csiescseq.len++] = u;
            if (BETWEEN(u, 0x40, 0x7E) || csiescseq.len >=
                                              sizeof(csiescseq.buf) - 1)
            {
                term.esc = 0;
                csiparse();
                csihandle();
            }
            return;
        }
        else if (term.esc & ESC_UTF8)
        {
            tdefutf8(u);
        }
        else if (term.esc & ESC_ALTCHARSET)
        {
            tdeftran(u);
        }
        else if (term.esc & ESC_TEST)
        {
            tdectest(u);
        }
        else
        {
            if (!eschandle(u))
                return;
        }
        term.esc = 0;
        return;
    }
    if (selected(term.c.x, term.c.y))
        selclear();
    gp = &term.line[term.c.y][term.c.x];
    if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT))
    {
        gp->mode |= ATTR_WRAP;
        tnewline(1);
        gp = &term.line[term.c.y][term.c.x];
    }
    if (IS_SET(MODE_INSERT) && term.c.x + width < term.col)
    {
        memmove(gp + width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
        gp->mode &= ~ATTR_WIDE;
    }
    if (term.c.x + width > term.col)
    {
        if (IS_SET(MODE_WRAP))
            tnewline(1);
        else
            tmoveto(term.col - width, term.c.y);
        gp = &term.line[term.c.y][term.c.x];
    }
    tsetchar(u, &term.c.attr, term.c.x, term.c.y);
    term.lastc = u;
    if (width == 2)
    {
        gp->mode |= ATTR_WIDE;
        if (term.c.x + 1 < term.col)
        {
            if (gp[1].mode == ATTR_WIDE && term.c.x + 2 < term.col)
            {
                gp[2].u = ' ';
                gp[2].mode &= ~ATTR_WDUMMY;
            }
            gp[1].u = '\0';
            gp[1].mode = ATTR_WDUMMY;
        }
    }
    if (term.c.x + width < term.col)
    {
        tmoveto(term.c.x + width, term.c.y);
    }
    else
    {
        term.c.state |= CURSOR_WRAPNEXT;
    }
}
int twrite(const char *buf, int buflen, int show_ctrl)
{
    int charsize;
    Rune u;
    int n;
    for (n = 0; n < buflen; n += charsize)
    {
        if (IS_SET(MODE_UTF8))
        {
            charsize = utf8decode(buf + n, &u, buflen - n);
            if (charsize == 0)
                break;
        }
        else
        {
            u = buf[n] & 0xFF;
            charsize = 1;
        }
        if (show_ctrl && ISCONTROL(u))
        {
            if (u & 0x80)
            {
                u &= 0x7f;
                tputc('^');
                tputc('[');
            }
            else if (u != '\n' && u != '\r' && u != '\t')
            {
                u ^= 0x40;
                tputc('^');
            }
        }
        tputc(u);
    }
    return n;
}
void tresize(int col, int row)
{
    int i;
    int minrow = MIN(row, term.row);
    int mincol = MIN(col, term.col);
    int *bp;
    TCursor c;
    if (col < 1 || row < 1)
    {
        fprintf(stderr,
                "tresize: error resizing to %dx%d\n", col, row);
        return;
    }
    for (i = 0; i <= term.c.y - row; i++)
    {
        free(term.line[i]);
        free(term.alt[i]);
    }
    if (i > 0)
    {
        memmove(term.line, term.line + i, row * sizeof(Line));
        memmove(term.alt, term.alt + i, row * sizeof(Line));
    }
    for (i += row; i < term.row; i++)
    {
        free(term.line[i]);
        free(term.alt[i]);
    }
    term.line = xrealloc(term.line, row * sizeof(Line));
    term.alt = xrealloc(term.alt, row * sizeof(Line));
    term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
    term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
    for (i = 0; i < minrow; i++)
    {
        term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
        term.alt[i] = xrealloc(term.alt[i], col * sizeof(Glyph));
    }
    for (; i < row; i++)
    {
        term.line[i] = xmalloc(col * sizeof(Glyph));
        term.alt[i] = xmalloc(col * sizeof(Glyph));
    }
    if (col > term.col)
    {
        bp = term.tabs + term.col;
        memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
        while (--bp > term.tabs && !*bp)
            ;
        for (bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
            *bp = 1;
    }
    term.col = col;
    term.row = row;
    tsetscroll(0, row - 1);
    tmoveto(term.c.x, term.c.y);
    c = term.c;
    for (i = 0; i < 2; i++)
    {
        if (mincol < col && 0 < minrow)
        {
            tclearregion(mincol, 0, col - 1, minrow - 1);
        }
        if (0 < col && minrow < row)
        {
            tclearregion(0, minrow, col - 1, row - 1);
        }
        tswapscreen();
        tcursor(CURSOR_LOAD);
    }
    term.c = c;
}
void resettitle(void)
{
    xsettitle(NULL);
}
void drawregion(int x1, int y1, int x2, int y2)
{
    int y;
    for (y = y1; y < y2; y++)
    {
        if (!term.dirty[y])
            continue;
        term.dirty[y] = 0;
        xdrawline(term.line[y], x1, y, x2);
    }
}
void draw(void)
{
    int cx = term.c.x, ocx = term.ocx, ocy = term.ocy;
    if (!xstartdraw())
        return;
    LIMIT(term.ocx, 0, term.col - 1);
    LIMIT(term.ocy, 0, term.row - 1);
    if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY)
        term.ocx--;
    if (term.line[term.c.y][cx].mode & ATTR_WDUMMY)
        cx--;
    drawregion(0, 0, term.col, term.row);
    xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
                term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
    term.ocx = cx;
    term.ocy = term.c.y;
    xfinishdraw();
    if (ocx != term.ocx || ocy != term.ocy)
        xximspot(term.ocx, term.ocy);
}
void redraw(void)
{
    tfulldirt();
    draw();
}
